RSI Vs QQQ Scan

I am trying to create a scan which comapres the Relative Strength Comparison of a stock to the QQQ's.
 The following code produces the indicator line:-
       { RSC - Relative Strength Comparison }
[horzline=0]
period:= input("Period",38,1);
index:=LoadSymbol("QQQ",C);
ROCD:=ROC(C,period,%) - ROC(index,period,%);
RSCD:=(( C/index - Ma(C/index,period,s)) / Ma(C/index,period,s))*100;
[name= RSC; width=2; color=black]
RSCD;

The problem is I am not able to create a scan which returns stock which have a result
with the " RSCD " > 0.
This would give me a list of stock outperforming the QQQ's and to be able to order them in terms of strength.
Every time I create the indicator, then scar for RSCD>0, it returns an empty result.

 If anyoune has a solution it would be much appricated.


Edited by lmbull - 10 Mar 2016 at 6:48am