Tracking difference and error indicate how well an index fund follows its intended path. Here's how to avoid common analytical mistakes. Download the report now.

The risk of your portfolio trailing popular benchmarks, such as the S&P 500, is a real risk that investors must take into account ...

Price changes in ETFs such as U.S. Oil Fund don’t always closely track changes in the price of the commodity.

Several things can contribute to tracking error, but the most likely culprit is optimizing.