I know some ETers have developed their own trendiness indicators. For example, acrary knows how to measure the trendiness of any market based on the number of days a trend persist (I hope I understand him correctly). I wonder if anyone knows how to combine trendiness and volatility. For example, a 10 days bullish trend can go up smoothly, or in a pretty volatile manner. Any input on how to approach this measurement? Or somehow, the way you measure trendiness has filtered out the volatile movement? Hence you would only trade the trendy market without volatile action.