Before selecting a investment manager or mutual fund, the manager or mutual fund track record should be analyzed from it's inception. While a minimum of five years of data should be reviewed (any less is probably meaningless) ten years or more is preferable. A major problem with most track records is that statisticians suggest between 30 and 140 years of data may be required to sufficiently document manager
Source: http://www.investorguide.com/igu-article-994-sector-etf-rotation-strategies.html
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