For those of you using the Advance/Decline line (NYSE, AMEX, Nasdaq or other) in your trading: 1. How do you use it? Or maybe the right question is; how does the majority of traders generally use it? Do you look for specific levels or do you just use it for estimating the overall trend or market sentiment? 2. Are there any specific "extreme" levels to look out for in this ratio? How high or low does it often go before mean reverting intraday? I just started using the AD but really like this kind of breadth indicators.