Dollar-Cost-Averaging: For Higher Return or for Lower Risk?

In the past couple of days, I did some further study on VFINX after Itook a look at the market value and shares owned at the beginning of 2007 if I started investment in January 1988 with four different investment schemes (here's the previous post). In this study, I want to find out the annual return for each investment plans from January 1988 to January 2007 and consider the risk of each plan by comparing the annual performance against S&P 500 during the same period.

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