QTAA Update: Conclustions and FAQs

Below we have updated our 2006 white paper.  While you can download the full 70+ page paper here, I’ve also chopped it up into a series of more digestible posts for the blog.  

The purpose in this paper was to create a simple-to-follow method for managing risk in a single asset class and, by extension, a portfolio of assets.  A non-discretionary, trend-following model acts as a risk-reduction technique with no adverse impact on return.  Utilizing a monthly system since 1973, an investor would have been able to increase risk-adjusted returns by diversifying portfolio assets and employing a market-timing solution.  In addition, the investor would have also been able to sidestep many of the protracted bear markets in various asset classes.  Avoiding these massive losses would have resulted in equity-like returns with bond-like volatility and drawdown.  Investors looking to tailor their portfolio may consider using alternate cash strategies, more assets in the portfolio, and alternative weighting schemes to find a portfolio that is right for them.


Below is a compilation of frequently asked questions we receive on a regular basis about the broad global tactical strategies presented in our book and white papers.  While we cannot speak specifically to how we manage money, we can speak broadly to the strategies in this paper.

We try to be as open and honest about the benefits as well as the drawbacks of every strategy and approach we research.

Of utmost importance is finding an asset management program and process that is right for you.

Where did you get your historical data?  Can you send it to me?

We used Global Financial Data and our agreement does not allow us to share the data.  However, there are many free sources of data available including this post we did on a list of free data sources.

How do you update this model?  What do you mean by “monthly price”?

The model, as published, is only updated once a month on the last day of the month.  Market action in the meantime is ignored.  The published model was only meant to be broadly representative of the performance one could expect from such a simple system.

Have you examined an all-in version where you invest 100% of the assets in whatever asset classes are on a buy signal?

Yes, but this eliminates the benefits of diversification and exposes the portfolio to large risks when only a few asset classes are on a buy signal.  In addition, it introduces unnecessary transaction costs.  Returns are higher but with an unnecessary increase in risk.  Investors seeking higher returns can use leverage or employ some of the rotation techniques mentioned in this paper.

Do you rebalance the asset classes monthly?

Yes.  Although we show in the book The Ivy Portfolio that it is important to rebalance sometime, the frequency is not that important.  For buy and hold allocations we recommend a yearly rebalance in tax-exempt accounts, and rebalancing based on cash flows in taxable accounts.  Percentage tolerance bands are another option for rebalancing decisions.

Have you tried various moving averages?

Yes.  There is broad parameter stability from 3 months on out to over 12 months. 

I like the strategy and want to implement it, should I wait until the next rebalance?

We usually invest immediately at the rebalance point.  While this can have a significant effect on short-term results, it should be a wash in the long term.  Investors worried about the short term can stagger their purchases over a number of months or quarters.

Where can I track the strategy?

You can track the strategy on a number of websites including StockCharts.com.  We also have a tracking feature on the blog.

What about using daily or weekly data?  Doesn’t only updating monthly expose an investor to dramatic price movements in the interim?

We have seen confirming data for various timeframes, some superior, and some inferior.  The question is valid – but also consider the opposite scenario.  What happens to a system that updates daily where a market goes down fast, then reverses and goes straight back up?  The investor would have been whipsawed and lost capital.  We expect the timeframes to have similar performance over the long term.

What is the best way for an individual to implement the leveraged model?

This is tricky.  If your broker has reasonable margin rates then leverage is justified.  Interactive Brokers is consistently fair here. For investors familiar with the product, futures are a good choice. One can also use an all-in cross-market rotation system detailed in the paper.

Why are you taking credit for using the 200-day moving average model?

We’re not, and we are very upfront that trendfollowing models have been around for over 100 years.

For the rotation system you’ve written about where you purchase the top performer over the past 1, 3, 6, 12 month periods, are you simply using the mean of the 1, 3, 6, 12 month performance to calculate the top performer?


Is the 10-month SMA crossover optimized for all (five) asset classes, or is it possible that different timeframes could work better for different asset classes?

Different timeframes will certainly work better (in the past), but what is unknown is the parameter that will work best in the future.  However, there is broad parameter stability across many different moving average lengths.

Have you ever tried adding gold to your model (or any other asset class)?

Yes, we use over 50 asset classes at Cambria – the paper is meant to be instructive.

Why did you choose the 10-month SMA?

Just to be representative of the strategy, and it also corresponds closest to the 200 day moving average. We chose monthly since daily data does not go back that far for many of the asset classes.

What software did you use to perform the historical backtests?


I am trying to replicate your results with X (Yahoo, Google, etc.) database and my results don’t match.  What gives?

The indexes disclosed in the paper and book are obtained from Global Financial Data.  We cannot fact check all of the data sources to see how they calculate their numbers but make certain that the numbers are total return including dividends and income.  For Yahoo Finance one needs to use the adjusted numbers – AND make sure to adjust them every month (or record the new returns for that month), a tedious process.

How is your ETF different then the model you presented in the white paper and book?

We cannot address questions about our funds here.  Feel free to email us or visit the fund information page here:


Why the expansion from five to more asset classes?  Have you tested this increased granularity?

Yes we have performed extensive research in house that demonstrates that increasing the number of asset classes (and sub asset classes and industries) that are not perfectly correlated improves risk-adjusted performance.  You can find a brief post here on our blog.

What is the long term expected volatility and drawdown targets?  Is 10% maximum drawdown for the GTAA Moderate strategy reasonable?

While the historical volatility (7%) and maximum drawdown (-10%) are good targets, by definition a portfolios largest drawdown is always in the future.  We foresee the possibility of a 20% drawdown as a possible scenario.

How will trend-following asset allocation perform in sideways markets?

In general, a market that oscillates can be a poor market for trendfollowers do to whipsaws.  However, one that examines Japan – a market that has had very poor performance for the past 20 years – would find that a trendfollowing approach would have still added significant value.

What do you anticipate the long-term correlation of this strategy to be, with the S&P 500?

This is a difficult question to answer since correlations are inherently unstable.  However, since most of the portfolio is in equity-like assets we expect the correlation to be quite positive.  Historically the correlation has been around 0.7 with buy and hold and 0.5 with the S&P 500.

In your opinion, is this strategy diversified enough for an investor to have a large % of his assets in it?

The strategy is designed as a core holding and an “all-weather” portfolio designed to perform in any market environment.  The fund’s underlying holdings represent over 20,000 securities across the globe.

I can see using the strategy as a core holding, however, because it can hypothetically have a significant equity exposure, what is the largest allocation you would give it in a conservative account? 25%?

That depends entirely on the investor and their risk and return objectives.  The fund is targeting equity like returns with reduced risk, and depending on the investor that is appropriate for a 0% to 100% allocation.

It doesn’t look like it benefits the portfolio much to time the bond portion, thoughts?

Trading lower volatility bonds doesn’t have much of a benefit, but timing higher volatility bonds (junk, emerging, corporate) tends to work well.