billb

The ETF-Squared: It Reallocates For You

I think studies have shown that quarterly is WAY too frequent. As a general rule, the less rebalancing the better. I believe the case was made that you'd mostly be rebalancing into bonds since stocks outperform and more money in bonds = lower return. So by rebalancing into bonds more frequently, your returns are pretty lousy over time.

I have not tried this myself, have only read of it.