Exchange-traded funds are never actively managed and often track a specific market or commodity indices.

Yet investors who bought the line that the fund would track the index were disappointed.

But the fund has closely tracked the Toronto index this year, producing a total return, in American dollars, of 14.8 percent in the first nine months.

Both funds track the same index.

The fund tracks the S&P 100 index.

Investec's fund tracks an index maintained by Internet.com, a Web publishing company.

A key to determining the best benchmark is a little number called R-squared, which tells you how closely a fund tracks an index.

The fund tracks the Russell 1000 index.

Most funds track one of two indexes.

The fund tracks the S&P 1500 index.