Ranking stocks by Percentage above a moving average

The rank by statement is intended rank results by simple indicator values or ticker properties. It does not accept arithmetic operations like addition, subtraction, division or multiplications, even though the scan engine usually does not flag them as an error.

That said, you might be able to make an indicator do what you want. See @lmkwin 's answer to

http://scan.stockcharts.com/discussion/comment/4028#Comment_4028

You might be able to use

rank by PPO(1,200,1)

I haven't tried this, so test it out.