R2

A measurement of how closely the portfolio's performance correlates with the performance of a benchmark index, such as the S&P 500. R² is a proportion which ranges between 0.00 and 1.00. An R² of 1.00 indicates perfect correlation to the benchmark index, that is, all of the portfolio's fluctuations are explained by performance fluctuations of the index, while an R² of 0.00 indicates no correlation. Therefore, the lower the R², the more the fund's performance is affected by factors other than the market as measured by that benchmark index.