2 Period ROC on Chart

This indicator is based on the chapter from the book Street Smarts by Linda B.Raschke. Original idea is to use the 2 period ROC in a separate window, but I made this to use it on the chart. It shows days when the market changes from buy to to sell day and vice versa. Use this on the daily chart.

Files:
2proc_euro.jpg  176 kb
2proc.mql  2 kb
chap08.doc  160 kb

Another version

Files:
2proc_v_3.mql  1 kb

Very useful indicator, I wonder if it can be coded to work as a MT4 indicator?