the effect of the bounce....what goes up tends to go down, and vice versa. Somethies a long term long is a short term short.
It never takes into account the effect of time, or percentage. A gain of 2 points on a 15 point StarBond is much more, percentage-wise, than the effect on a StarBond worth 80. Similarly, a gain of 2 points in a month is much more important than a gain of 2 points in 10 months.
Thus, the importance of dROI.
From time to time, you have to do your own math...
Oh yes.... THE NUMBERS is still a good source