Please Note: Blog posts are not selected, edited or screened by Seeking Alpha editors.

Commodity Stocks: Improving Returns With No Extra Volatility

Commodities are the necessary building blocks of the world. Glance around you-commodities are what the world needs to live and prosper and are everywhere you look. The world's seven billion people need resources, and that's why we recommend investors consistently allocate a portion of their portfolio to a natural resources investment.

Not every investment is the same, though. Even within the commodities space, when looking at measures such as correlation, performance and risk, two indexes can have very different effects on a portfolio's results.

Take two popular commodity-related indices for example, the Dow Jones-UBS Commodity Index (DJUBS) and the Morgan Stanley Commodity Related Index (CRX).

The DJUBS is made of futures contracts on various physical commodities that represent major commodity sectors such as agriculture, energy, grains, metals, livestock and precious metals. Basically, futures are contracts between a buyer and seller, where the buyer agrees to purchase a specific commodity for a specific price and specific time in the future.

The CRX is comprised of stocks involved in commodity related industries, such as energy, non-ferrous metals, agriculture and forest products.

Yet, while both indices are diversified across various commodities, their correlations to the overall market differ.

Correlation Matrix Over 10-Years

Take a look at the matrix looking at 10 years of data. The table lists the S&P 500 Index, which represents the overall U.S. stock market, and the two commodity indices. When two asset classes or investments are perfectly correlated to each other, their performance moves are in sync and they have a correlation of 1; 0 means that the two investments have no correlation to each other.

Over the past decade through June 30, 2012, you can see the DJUBS and the S&P 500 have had a correlation of 0.80. The CRX and the S&P 500 had a correlation of 0.62. This means the CRX is less correlated to the overall market than the DJUBS.

And why is a low correlation beneficial? In a diversified portfolio, it can reduce an investor's volatility.

In the article "Material World," Financial Planning found that a low correlation is a "valuable feature" for natural resources mutual funds. When author Craig Israelsen compared the correlation to the overall market to the 10-year annualized returns of 18 natural resources funds with 10 years of performance records, "a clear pattern" emerged. "Natural resources funds with lower correlations (that is, closer to zero) had better performances during this span," he says.

See the article now.

Over the past 10 years, this pattern was prevalent in the CRX, as commodity producers far outperformed the index of commodity futures.

CRX Outperformed DJUBS Over Past 10 Years

How to Optimize Your Portfolio with Commodities

So how do correlations and long-term performance translate to your portfolio? One way to look at this would be to create an efficient frontier, which charts a range of allocations to commodities and the overall market to see which portfolio would be most efficient, i.e., which portfolio enhances returns without adding risk.

To find the optimal portfolio between commodities and the overall market, the efficient frontier plots different portfolios, ranging from a 100 percent allocation to an investment in the S&P 500 and gradually increasing the percentage of commodities. Each dot along the path of the efficient frontier represents an incremental increase toward a 100 percent allocation to commodities investment.

First, we chart the efficient frontier of the DJUBS and the S&P 500. A 100 percent allocation to the S&P 500 would result in a portfolio achieving a 5.9 percent return and 20.3 percent annualized volatility.

Assuming the portfolio was rebalanced each quarter, our research found that a portfolio holding 25 percent allocation to the commodities futures and 75 percent allocation to an investment in U.S. equities would decrease an investor's return by about 0.17 percent while decreasing volatility by a little more than 3 percent. Simply, the addition of commodity futures yields less volatility for about the same return.

25% Allocation to Commodity Futures

A different picture emerges when you chart an efficient frontier for a portfolio invested in commodity equities and the overall market. In a portfolio of 25 percent commodity equities and 75 percent U.S. stocks, an investor reduces their risk by almost 1 percent while increasing their return by nearly 1.5 percent.

25% Allocation to Commodity Stocks

How Resourceful Is Your Portfolio?

The charts above illustrate how commodities enhance a portfolio, although a 25 percent allocation may be a little too aggressive. For reference, about 15 percent of the S&P 500 Index is made up of energy and materials companies.

What's important is putting commodities to work for you. With a lower correlation to the market and historical outperformance, we believe commodity stocks are a powerful addition to your portfolio.

U.S. Global Investors, Inc. is an investment management firm specializing in gold, natural resources, emerging markets and global infrastructure opportunities around the world. The company, headquartered in San Antonio, Texas, manages 13 no-load mutual funds in the U.S. Global Investors fund family, as well as funds for international clients.

For more updates on global investing from Frank and the rest of the U.S. Global Investors team, follow us on Twitter at www.twitter.com/USFunds or like us on Facebook at www.facebook.com/USFunds. You can also watch exclusive videos on what our research overseas has turned up on our YouTube channel at www.youtube.com/USFunds.

The Morgan Stanley Commodity Related Index (CRX) is an equal-dollar weighted index of 20 stocks involved in commodity related industries such as energy, non-ferrous metals, agriculture, and forest products. The index was developed with a base value of 200 as of March 15, 1996. The S&P 500 Stock Index is a widely recognized capitalization-weighted index of 500 common stock prices in U.S. companies. The Dow Jones UBS Commodity Index is composed of futures contracts on physical commodities, and includes commodities traded on U.S. exchanges, with the exception of aluminum, nickel and zinc, which trade on the London Metal Exchange (LME). Diversification does not protect an investor from market risks and does not assure a profit.

Disclosure: I have no positions in any stocks mentioned, and no plans to initiate any positions within the next 72 hours. I wrote this article myself, and it expresses my own opinions. I am not receiving compensation for it. I have no business relationship with any company whose stock is mentioned in this article.