SuperCycle Seasonal Timing Methodology for the SP-500

MODEL UPDATE – 21 October 2013
The long-only strategy (STM L) is performing 1.7 times that of the SP-500 buy-&-hold whilst the long and short strategy (STM L+S)  is performing 3.1 times that of the SP-500 buy-&-hold since January 2009 (latter part of 2007-2013 out-of sample period.) Both models under-performed the SP-500 for September & October since they were in cash when the SP-500 rose in these months.
STM_SP500_26

1.BACKGROUND
This is a quantitative actuarial trading model for the SP-500, using purely multi-annual cyclical historical seasonal statistics to govern if it is invested in the market or not. There are no traditional technical metrics used (moving averages or market breadth) nor are any econometric models deployed in the seasonality determinations. The model is actually a pair dubbed STM-L (Seasonality Trading Model longs-only) and STM-LS (Seasonality Trading Model – longs and shorts.) Both models deploy two-times leverage on rare occasions when the statistical algorithm deems probabilities to the upside (or downside) to be highly favorable and move into cash when the statistical outcomes appear uncertain.  For now, the specifics of the parameters used by the algorithm remain proprietary.

STM provides a monthly stock-market  “Seasonality Strength Signal” ranging from -2 to +2 for up to several months in advance. All trading decisions and actions occur on the last working day of the calendar month. There is finality in these decisions, as the signal is never revised, and since you know the market position you should assume in advance and the date you must execute the transaction, you can plan accordingly. The correlation between the Seasonality Signal and subsequent SP-500 average monthly returns is remarkable and the table below guides your month-to-month stock-market actions accordingly:
STM_SP500_13

Apart from  stunning returns predictions, we have another interest in the STM model and that is its remarkable ability to rely purely on seasonal factors to accurately forecast bear market and recession risk. The main reason STM outperforms the buy-and-hold is that it manages to avoid the worst of almost all significant market downturns since 1957.  The fact that none of the seasonality metrics used in the heuristic algorithm are subject to any revisions, makes this even more attractive. Up until now we have been expanding on traditional econometric methods to improve our forecasts and probability measurements of recession, but now we are beginning to understand the important role seasonality can play in enhancing this endeavor. The fact that research on the use of seasonal methods to forecast recession is relatively new (and undocumented) makes this all the more rewarding. This is of course our main interest, with the market timing benefits secondary.

2.Long-only Strategy
In the long-only strategy, we are in cash when the STM signal is below +0.5 and in un-levered SP-500 long positions otherwise. The total return (TRI) is simply the re-invested growth of $1 since 1957, excluding transaction costs, dividends or interest received whilst in cash. Besides a high winning rate, the other important metric for any trading system is the gain/loss ratio (also known as the risk/reward ratio) which shows how many winning points there are in all the winning trades divided by how many losing points there are in all the losing trades . Strong short-term trading algorithms require at least a 3 to 5 ratio whilst investment models should be at least 10-to-1 or more.
STM_SP500_31

Let us now examine the sequential trade gains/losses booked by the model (no leverage included):
STM_SP500_9

The above chart shows us that gains and losses are evenly spread and not tilted to any one historical decade nor changing in any discernible trend. This type of repeated consistency is important in long-run historic models. Also of importance to us is how the gains and losses are distributed, which is shown below. This has all the hallmarks of a good trading model. Much more green bars than red bars and much taller green bars than red bars. Small number of losses and winners swamping the losers in size. Remember, all these returns are with no leverage.
STM_SP500_10

The fact that over a long time horizon of multiple business cycles, we can consistently out-perform the SP-500 by a factor of 37 times, with no leverage and for only 55.6% exposure to the stock market (in cash for 44.4% of the time) is truly remarkable. The table below depicts yearly returns through the decades compared to the SP-500. While STM does not consistently have more positive years than the SP-500 (% Up column) nor consistently has more better years than the SP-500 (%Best column), she consistently has far less large negative years and this is primarily responsible for the huge out-performance of the buy and hold.
STM_SP500_3

3.Leverage in “Power Months”
On average, about once every  6 months (approximately 17% of the time), STM deems conditions statistically “highly favorable” where probabilities of a positive month exceed 80% and where historic gains outpace historic losses by more than 9-to-1. STM shows a signal strength of  +1.25 and more for these “Power Months”, and the model levers up twice (2 times leverage) during these months. The higher the STM signal the more “Power” behind the expected return and gain-to-loss metrics. These months (which are not the same months every year) effectively raise the overall gain/loss ratio of the model since 1957 from 10 to 15. This implies the introduction of leverage during the Power Months lowered model risk as opposed to raising it as one would expect. For such a short amount of the time we are levered up, the boost in gains are astonishing, delivering just under 973 times the total cumulative return  of the buy & hold:
STM_SP500_30

The statistical distribution of the monthly SP-500 un-levered returns on the 114 Power Months encountered by the model since 1957 is displayed below. Just double  the returns in the chart to get a view on the actual  leveraged returns the model would have been making during the “Power” months in question.
STM_SP500_5

The chronological trade returns shown below include the returns of leveraged months that may be present in a particular trade. Sometimes up to three leveraged months may be present in one particular STM multi-month trade which has the effect of boosting individual trade returns significantly:
STM_SP500_11

To truly demonstrate the power of the leveraged months, look at the statistical trade return distribution  of the levered versus the un-levered strategies:
STM_SP500_12

Of major interest now is if the introduction of leverage at select points (only 17% of the time) impairs the draw-down characteristic of the model. The two charts below show how the introduction of 2x leverage at very select points in time (only 114 months were leveraged in the total of 681 months since 1957) has an almost negligible impact on draw-downs which is testament to the powerful, consistent returns to be had during the “Power Months”:
STM_SP500_6

The most notable introduction of unwanted additional draw-down as a result of leverage is 1978, but this is the only instance of significantly more undesirable results. An important note on rolling draw-downs – the above and below charts only consider rolling 12-month windows whilst in many instances bear markets can last up to 18 months.
STM_SP500_7

What both of the above charts show us is that the maximum draw-down on the STM (un-levered) was 15.7%, the maximum on STM (levered) was 15.8% and the maximum on the SP-500 buy-and-hold was a stomach churning 47.5%. Also, the fact that virtually every SP-500 bear market was accompanied by dramatically lower draw-downs for the seasonality model proves beyond  a shadow of doubt that periods of protracted poor performances on the U.S stock markets have a statistically significant seasonality factor associated with them.

The decade-by-decade performance of the STM long-only strategy with PowerMonth leverage is displayed below. Besides cranking up returns considerably, the %Best and %Up columns show considerable improvement over the un-levered long-strategy’s table:
STM_SP500_8

4. Shorting the market
From the Seasonality Signal Strength table in Section-1 we see that it is statistically worth your while shorting when the STM signal is less than or equal to -0.25. In fact, when the signal is less than or equal to -0.5 it becomes a compelling case for using leverage on the short since these months are characterized by losses more than 80% of the time and winning points on your trades will exceed losing points by a factor of 6-to-1 or more. The lower the STM reading, the more compelling the statistical case is in favor of shorting the SP-500 and thus the more viable it is to introduce leverage. The statistics below show how the introduction of shorting to the “Longs-only with Power Zones” strategy actually reduces risk while boosting returns. This is most notable in the substantive improvement in the overall gain/loss ratio of the strategy, which almost doubled. It is important to note that shorting on its own, whilst a viable and profitable strategy, only has a 72% win rate and a 8:1 gain loss ratio. However, the introduction of shorts together with the  long positions that make up a single continuous multi-month seasonal  trade  is where the magic happens, since if a short goes wrong, the overall gains on the long trades will absorb the short losses, and vice versa.
STM_SP500_14

The trades listed above consist of 125 separate periods in the market, each consisting of multiple contiguous months with multiple long or short positions as dictated by the STM signal chart. Each trade is separated by at least one month of being in cash. The minute we move to cash the current trade is deemed completed. The sequential trade gains are shown below, and you can see they are significantly higher than the longs-only strategies, particularly when the SP-500 is in a protracted bear market or there is a recession:
STM_SP500_15

Sorting the above trades from low to high gives us an idea of the trade distribution curve and hence the positive expectantly of the strategy:
STM_SP500_16

Finally, the decade-by-decade performance of the Long + Short + Levered strategy is depicted below:
STM_SP500_17

5. Bull market performance examination
One big  litmus test for a trading model, especially a “macro-level” one that attempts to avoid the large draw-downs, bear markets and recessions is its ability to outperform the buy-and-hold in a raging bull market. Many macro level models (such as our Composite Market Health Index or CMHI) that deploy traditional moving averages and/or other technical indicators have the ability to avoid the major damage areas but pay the price in tardiness in getting back into the early stages of the bull market that ensues. You would be surprised by how much this Achilles heel impairs performance since a large chunk of the gains to be had in any bull market originate from the first 30% of its existence. In many cases, traders accept that their timing models may not outperform the bull market buy-and-hold, considering the loss in efficiency the “insurance” they have to pay to avoid getting caught in the big corrections that cause all the damage. The STM consistently out-performed the SP-500 buy and hold in 75% of the bull markets considered, with the 2009 one shown below at at 20th Oct 2013:
STM_SP500_1
The above chart is updated daily for our subscribers in the live CHARTS menu, and shows how, as at 20 Oct 2013, the long-only strategy had out-performed the SP-500 by 1.7 times and the long + short strategy by 3.1 times. The thin dotted lines are simply the equity of the timing model divided by that of the SP-500 to figure out how many times the model has out-performed the buy-and-hold. When the dotted lines move up, it means the timing model is out-performing the buy-and-hold, and when the dotted lines move down, it means the timing model is under-performing the buy-and-hold. We need to see the dotted lines going up more than they are going down, and showing a rise from bottom left to top right of the chart, otherwise the timing models are not worth the effort. The individual trade statistics for the above period are shown below.
STM_SP500_18

It would be safe to say that both strategies are out-performing model  expectations from a gain/loss and win rate perspective, considering the SP-500 returned a TRI of 2.1 or 112% gain versus the 262% and 553% gains shown in the table. Whilst a return of 262% from STM-L versus 112% from the Buy-and-Hold may not seem like much to write home about, we must take cognizance of the fact that STM-L was only invested in the stock market 55.2% of the time! If we were to adjust the STM return to take it to the comparable risk of 100% market exposure of the buy-and-hold model, then STM-L would deliver 262/55*100=476% return for equivalent buy-and-hold stock market exposure.

6. Bear Market Performance evaluation
We will now examine the performance of the STM model in relation to the SP-500 buy-and-hold and past recessions and bear markets. The first example covers the Great Recession. We see the SP-500 experienced a peak-to-trough draw-down of 52.6% whilst both STM derivatives only drew down 14.7% peak-to-trough. Almost every known documented seasonality model suffered in the 2008 crash but STM suffered minor abrasions. At the end of the day, STM emerged from the recession with substantially more money in the bank than the buy-and-hold having withstood far less gut-wrenching draw-downs.
STM_SP500_19

Now look at the 12-month moving average of the SP-500 which would have kept us very nicely out the recession  and getting us back in right after the recession ended. Whilst the moving average would have skirted the losses made by STM-L  it would have missed the large trade in the trough of the business cycle. This is common with moving averages (they get back in too late) and impairs returns substantially since the first few trades in a business cycle trough are typically where the bulk of gains are to be had.

Below is the 2000 to 2002 bear market and 2001 recession. In this case both STM models excelled over the buy and hold, climbing during the course of the bear market and experiencing negligible draw down. Again, we see the 12-month moving average of the SP-500 monthly prices would have kept us neatly out of the bear market, but it was a complete laggard in getting back in again, missing gains of 19.5% before climbing back into the market. In this example the STM comprehensively outperformed the moving average strategy.
STM_SP500_20

We now look at something different – namely a crash as opposed to a bear market or recession. Black Monday refers to Monday, October 19, 1987, when stock markets around the world crashed, shedding a huge value in a very short time. The crash began in Hong-Kong and spread west to Europe, hitting the United States after other markets had already declined by a significant margin. Potential causes cited for the decline include program trading, over-valuation, lack of  liquidity, and market psychology. But what does not get spoken about a lot is that this time period ranked poorly from a seasonal period. Whilst the lousy seasonality itself was not responsible for the crash, it left the US markets vulnerable and thus an exogenous shock was compounded by the unfavorable seasonality. We have found very few technical-oriented macro-market timing models that managed to skirt the Crash of ’87 (the crash and subsequent rebound were too rapid) but STM sailed right through it as shown below. As you can see, the 12-month moving average of the SP-500 got out the market when the worst was over and then proceeded to miss out on the subsequent rebound – a real double whammy. STM started staying clear of the market 3 months before the crash and also nailed the bottom entry perfectly.
STM_SP500_21

Let’s get back to recessions with the 1974 example below. As with the 2008 great bear market, STM experienced one-third the peak-to-trough draw-down of the SP-500 whilst entering the new economic expansion with considerably more funds in her equity account that the buy-and-hold investor. The 12-month moving average of the SP-500 again got us deftly out the way of the bear market but got crucified by missing out on about three-quarters of the rapid 49.9% market rebound. You will also see that we had a Death-month followed straight after with a PowerMonth which considerably boosted returns of the STM L+S strategy. Note how the STM models nailed the bottom entry perfectly.
STM_SP500_22

The final bear market we cover in detail tells much the same story – agonizing 32% draw-down for the SP-500 and only 4.9% for the STM models. Again, the 12 month moving average appears to allow us to skirt the bear market but is tardy in getting us back in again on the sharp rebound. The STM models enters the new business cycle expansion with  equity accounts considerably larger than the buy and hold investor.
STM_SP500_23

We have covered 5 large corrections in detail but there are approximately 9 in total since 1957 that all tell a very similar story. The fact that virtually every SP-500 bear market was accompanied by dramatically lower draw-downs for the seasonality models proves beyond  a shadow of doubt that periods of protracted poor performances on the U.S stock markets have a statistically significant seasonality factor associated with them.

Lest you let the above charts tempt you to run your investment program on a 12-month moving average of the SP-500, be warned that such a strategy delivers only 1.4 times the performance of the buy-and-hold at best as it suffers from false alarms (whipsawing) and late re-entries that significantly impair overall long run returns. The charts we showed you of the big bear markets paint the moving average in a very good light. Whilst it is true that every recession was presaged by a dip of the SP-500 below her 12-month moving average the converse is not true – i.e. every dip of the SP-500 below the average did not result in a recession or bear market!

7. STM Signals
STM provides a monthly stock-market  “Seasonality Strength Signal” ranging from -2 to +2 for up to several months in advance. All trading decisions and actions occur on the last working day of the calendar month. There is finality in these decisions, as the signal is never revised, and since you know the market position you should assume in advance and the date you must execute the transaction, you can plan accordingly. The correlation between the Seasonality Signal and subsequent SP-500 average monthly returns is remarkable and the table below guides your month-to-month stock-market actions accordingly:
STM_SP500_13

Let us examine the SP-500 return distributions for each of the “Death-zone”,  “Bearish Zone”, “Bullish Zone” and the “Power Zone” months respectively. The tables below shows the distribution of SP-500 un-levered monthly returns. With the recommended leverage for Power-zones and Death-zones, the monthly gains/losses would have been double those shown below:
STM_SP500_27
The “Power Months” occur only 17% of the time but are truly not to be missed since over 85% of these months land up being positive on the SP-500 with an average un-leveraged gain of some 3.2%. But what is more important is that the cumulative percentage points of all the positive months were over 12 times more than the cumulative percentage points for all the losing months! This gives a risk/reward ratio of over 12 times, meaning for every percentage point you lose in one Power Month, you will claw-back 12 on a subsequent Power Month! This is why we recommend a 2-times leveraged position to take advantage of this high positive expectancy during these periods.

Also note that whilst a great deal of the returns of the seasonal strategy come from trades conducted during the “Bullish Zone”  months you must note that a sizable chunk of the months (some 32%) lead to losses, sometimes of up to 10%. This is why we call seasonal strategies “blunt instruments” – they are never perfectly right all the time but if you stick with them long enough they are mostly right and the returns of the right trades will eventually swamp the losses of the wrong trades (by a factor of 2.8-to-1 as the chart shows.) This is why you should not be the least bit surprised if the model shows a bullish month and it lands up being a negative month. Pinpoint month-by-month accuracy is not the objective here – this is a game of attrition – and with the odds on your side, provided you play long enough you will come out ahead. Do not let the losses in the Bullish Zone chart concern you – remember, this chart shows the distribution of individual SP-500 monthly returns, which from a STM trade basis is not really of your concern since most STM trades will consist of 2 to 6 months strung together. That is why individual STM trades, composed of many months of various seasonality signals have an expectancy of over 80% and 28:1 gain/loss ratios.

With regards the “Bearish Zone”,  it is interesting to note that the statistical expectancy (%win, gain/loss ratio) of these months to the downside is almost identical to those months to the upside for the “Bullish Zone”. Thus you have equal odds making money on the shorts in one particular month as you have making money on the longs in a bullish month.

The “Neutral Months” are interesting. They are an equal mix of very negative and equally positive returns. There is a slight statistical negative expectancy on the left hand chart below (when STM=0) and almost no statistical expectancy on the right chart below (when STM = +0.25)  – and that’s why the model prefers to stay in cash. Again, the distribution of SP-500 un-levered monthly returns during periods when the STM model is showing a “0” or “+0.25″ signal shows that there is an almost equal probability you will count your blessings for dodging a huge correction or curse your luck for being in cash when the market rallies hard. The reason cash is preferred in the neutral state is that if the market corrects hard, then you’ve avoided some losses, but if the market rallies hard and you are in cash then all you have lost is opportunity and not real hard cash out of your trading account. There is a difference!
STM_SP500_28

In the absence of any desirable statistical expectancy either way the model plays it safe and tucks away in cash. Do not confuse the neutral zone with neutral returns on the SP-500 – on the contrary returns can be volatile -and in any direction- during these periods, as shown on the above charts. It’s just that in the absence of compelling odds in our favor (from a purely seasonal sense) for shorts or longs, we take the safe route to cash to fight another day.

8. STM Signal Strategy Options:
The various ways you can execute the STM signals are shown below. The “Long-only” strategy goes long when the signal is >=0.25 (but uses no leverage) and is in cash otherwise. The “Long+Short” does the same as the “Long-only” but also shorts when the signal is less than or equal to -0.25. The leveraged strategies deploy additional 2x leverage whenever the STM signals a PowerMonth or a Death Zone month. Note how the longs-only strategy, deploying leverage during the high-confidence Power Months actually beats the longs+shorts (un-leveraged) strategy. This is the recommended strategy if you are unfamiliar, uncomfortable or incapable (due to your fund mandate) of shorting the market.
STM_SP500_29

9.STM Live Signal Charts
The STM strategy is live on the CHARTS menu for subscribers as a separate menu-tab “STM” next to the SP500 Market Timing Project ,  CMHI,  Great TroughZweig Redux and the Selling Pressure  tabs. It will provide a daily update of the SP500, the STM signal looking forward 6 months (the example below only shows 1 month forward), the projected returns as well as all LONG/CASH/SHORT and Power signals in a rolling 6 year window.  Tall green shading (+2) indicates Power Months, shorter green shading (+1) indicates normal long months, normal red shading (-1) indicates shorting months and tall red shading (-2) indicates Death-zone months and no shading (0) represents months in cash. Hovering your mouse over any month will raise a tool-tip on the screen with the actual values for STM signal, SP-500 and the suggested position you should be taking. You can also click on the round blue “i”  icon for more help when viewing the chart.
STM_SP500_24
Clicking on the “STM-TRI” tab provides a daily updated performance comparison of the long strategy (STM-L) and the long+short strategy (L+S) versus the SP-500 since January 2009. The red dotted line is the total return index (equity account) of the long+short model divided by that of the SP-500 and the green dotted line is the TRI of the long-only model versus the SP-500. When these dotted lines are rising it means the respective seasonality model is out-performing the SP-500 and when the lines are falling it means the models are under-performing the SP-500. Hovering your mouse over any month will reveal a tool-tip with all the relevant values. As shown below, the tooltip is telling us that as at 21 October 2013, the long-only strategy turned $1 into $3.51 (a 251% gain since January 2009) and it has grown its account to 1.7 times that of the buy-and-hold (“LONG REL”). It is telling us the recommended position for October is “0” or CASH. You can see the SP-500 rose in October whilst both models were in cash and thus the seasonal models UNDER-performed the buy and hold as shown by the falling dotted lines from September to October.
STM_SP500_25

We see from the above chart that a “+1″ (normal un-levered long) position is recommended for November. In the subscriber version the chart shows up to 6 months in advance. This is very useful as this is a dynamic heuristic seasonal model meaning a position taken on one month is not usually the same position taken for that month every year.

10. Some techniques of use
It is important to not use the STM Seasonality signal literally for all your stock market operations. Just because STM is forecasting a bearish 3 or 6 months does not mean you must liquidate all your investments! Seasonality models are “blunt instruments” and despite their stellar returns, there are plenty of wrong way calls on the way to high returns. You can either elect to use the STM Seasonality signal as a “backdrop” signal to tell you if the stock market is likely to encounter headwinds or tailwinds, or you can trade it separately as one of many strategies in your arsenal. For more details on how we recommend you do this, read our article “Market Timing & Recession Models – Putting it all together.

If you see a bullish few months , or even if you are lucky enough to see a Power-month  coming up the next month, and we are in or have just seemingly rebounded from a reasonably sized (5% or more) correction, then you know you have an even better chance of making a success from the trade. If however the market has run up very strongly during what were supposed to be weak months then you will be more circumspect on the odds offered by upcoming bullish seasonal periods. We are commissioning further research to improve accuracy of the STM signal based on the prior rise or fall of the SP-500 2-3 months before the month being forecast, but for now you must make your own judgments on this matter. Alternatively,  just follow the model blindly as done with the back-tests described in this document.

You can implement “leverage” on the STM Power months and Death-zone months in one of four ways:

  1. Deploy derivatives or futures contracts on the SP-500 where a margin (deposit) will be required that is much smaller than the amount being exposed (placed) in the market;
  2. Double your normal “bet size” – place 2 contracts in the market on Power months  instead of the normal one you may use (as an example if you never bet your entire account on a trade)
  3. Bet half your account on the  un-levered months and deploy the full amount on the leveraged Power months.
  4. Only trade the SP-500 on the Power months

All of the above options are valid  for taking advantage of the extra positive statistical outcomes provided by the Power months.

11. Conclusion
There is an undeniable, long term persistent seasonality element inherent in  the U.S stock markets. The STM timing model extracts 80% of these seasonal trends to produce a low risk high-reward trading model. We did not include the 2007-2013 period in STM’s  repertoire of data for its probability modelling and the performance of the model in the out-of-sample period has exceeded all expectations. However, as with any model, the decisions are based on statistical probabilities taken from past market behavior and seasonal tendencies are not guaranteed to continue persisting into the future, since past returns are no guarantee for future outcomes. However, other than having a true crystal ball that can gaze into the future, probability outcomes are our next best option.

We aim to complete further research into the use of the STM in recession forecasting as well as the introduction of the Recession Forecasting Ensemble (RFE) components into the STM trading model to virtually eliminate all the bad trades STM concluded in bear markets. It makes no sense to be trading with STM if the RFE is on high alert for recession for example. This will considerably improve the winning rates for STM. For now, the STM models are offered at no additional cost for current subscribers until we complete at least a year of out-of-sample trades.

About Dwaine Van Vuuren

Dwaine has a Bachelor of Science honors degree and is a full-time trader and investor. His passion for numbers and keen research & analytic ability has helped grow RecessionALERT into a company used by hundreds of hedge funds, brokerage firms and financial advisers around the world.

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