The chart below measures the percentage of high relative strength stocks that are trading above their 50-day moving average (universe of mid and large cap stocks.) As of 4/21/10.
The 10-day moving average of this indicator is 97% and the one-day reading is 98%. This oscillator has shown the tendency to remain overbought for extended periods of time, while oversold measures tend to be much more abrupt.
[...] the Market is Overbought? As we frequently point out, diffusion indicators have a tendency to remain overbought while oversold measures tend to reverse [...]