Let's look at 1999 and the BPNDX: <A HREF="http://stockcharts.com/def/servlet/SC.web?c=$BPNDX,uu[h,a]daclnnay[d19981020,19991231][pc20!f]&pref=G" target="_new">http://stockcharts.com/def/servlet/SC.web?c=$BPNDX,uu[h,a]daclnnay[d19981020,19991231][pc20!f]&am...</A> It crossed down over the 20EMA 16 times in 1999. Now lets look at the NDX during 1999: <A HREF="http://stockcharts.com/def/servlet/SC.web?c=$ndx,uu[h,a]daclnnay[d19981020,19991231][pc20!f]&pref=G" target="_new">http://stockcharts.com/def/servlet/SC.web?c=$ndx,uu[h,a]daclnnay[d19981020,19991231][pc20!f]&...</A> It began the year at 1850 and ended at 3750. Using this cross in 1999 would have resulted in whipsaws while the market was making higher highs and higher lows while maintaining an uptrend. The cross is better applied in a bear trend, IMO.