Appreciate your thoughts, thinskis. I don't know much about this method, just observing it. I think ROC (3) is better simply because the chart here:
Need to copy and paste the links.
http://stockcharts.com/def/servlet/SC.web?c=$INDU,uu[w,a]dacayyay[dc][pd20,2!d13,2.618!f][vc60][iut!Ld13!Lm3]&pref=G
it shows the latest ROC (3) high is a higher high, which means the market will go higher, which it did.
However, under ROC (2), the two recent highs are pretty much the same, not so clear:
http://stockcharts.com/def/servlet/SC.web?c=$INDU,uu[w,a]dacayyay[dc][pd20,2!d13,2.618!f][vc60][iut!Ld13!Lm3]&pref=G
In today's action, while ROC (2) made a lower low after yesterday's trading, ROC (3) hasn't made a lower low yet. If I'm using ROC (2)'s lower low to confirm the trade, I would expect today's action not to exceed the high we had two days ago, so I can trade some "short skirt" short. This is not the case, ROC (3) will probably keep me from shorting it yet. Of course, I'm NOT an expert in this ROC thingy, nor do I claim to be one. So I respect your thoughts on ROC (2), and when you say there are lots of missing info, I would try to figure them out... maybe by backtesting.
Thanks for sharing your thoughts.