We all take risks, especially when investing our hard earned money. And, most of us have heard that risk and return are closely linked. Risk is an important factor in asset selection, because if you select an investment that is more volatile or goes down more than you can handle, you may be tempted to make irrational choices at the wrong time – such is typical of the “sell low and buy high” crowd.
As I approach the brink of financial independence, I want to reduce my risk. I won’t need to take so many chances anymore. I will have enough. Of course, I do not want to eliminate all risk as I believe some is necessary to continue to grow, slow and steady. So, how does one go about assessing risk?
It’s easy to calculate the returns on investments, but evaluating the risk is much more nebulous. Everyone has a different definition of risk and how to quantify it. One approach that I have used in the past applies the statistical measure called standard deviation.
Standard Deviation can be calculated based on returns over several years and provides insight into how often an investment's return is different than its mean return and by how much.
How much return does risk-taking buy you? To help answer that question, I created the following table with data that was pulled from this Matt Krantz article in USA TODAY. The analysis begins with the average annual compound returns and standard deviation for several asset classes over a bunch of years. The return data was derived from the market research firm Global Financial Data.
From there, I calculated the 68% confidence intervals for one standard deviation. For normally distributed data, 68% of the values will be within one standard deviation of the mean, while 90% will be within 1.645 deviations of the mean. So, it is very likely that the return for an investment will fall within the minimum and maximum values provided in the table. I then determined the return to risk ratio for each investment type.
The return/risk ratio is the amount of percentage points of return that can be expected for every percentage point of risk. In other words, how much risk is involved in achieving the return. Volatile investments, with average or poor returns, such as oil and emerging markets, have low ratios.
With a little bit of study, the table can provide some valuable information. For instance, you may notice that value-priced stocks have beaten the S&P 500 and are considerably less risky. In fact, its even money for value stocks. Surprisingly, corporate bonds have an excellent ratio providing good returns for low volatility, while municipal bonds do not appear to pay out enough to compensate for the downside risk.
Housing is another interesting asset class that has an extremely low return to risk ratio. It averages 3.5% return, but it has significant volatility. This is one of those asset classes that is difficult to make a broad assessment because property values vary considerably with location. While I have seen steady appreciation in my neighborhood, others have seen sky-rocketing home values and now plunging prices. Another thing to keep in mind when looking at this data is that some of these assets, like gold and housing, have not historically been considered investments.
One other item of note is the years column. This indicates how far the data series goes back – the more years, means more data and more reliable numbers. Gold is the only asset class with data for more than 200 years.
What other information can you glean from this data? Were you surprised by the return to risk ratios associated with certain asset classes?
