A question from Yahoo! Answers:
How do you assess the performance of different mutual funds?
When usually each one is better than the others over different periods? And what is the best period to consider?
To really assess performance of mutual funds (i.e., assess it on a style-adjusted basis), you need a decent data library and a solid understanding of quadratic programming.
William F. Sharpe, Asset Allocation: Management Style and Performance Measurement: