exploration

["Kush Jhingan" <kush_j@xxxxxxxx>]

Hi Friends,
 
I wud be gratefull for help with an exploration 
wherein i want to isolate 
 
securities where the close has just crossed above 
the SAR.The explorartion
 
that I'm using is pasted below and the error msg as 
well:-
 
  Exploration notes THOSE CO'S 
WHERE THE CLOSE TODAY HAS  JUST CROSSED ABOVE THE 
SAR   Col A: CLOSE CLOSE Col B: 
SAR SAR(0.02,0.20) Col C: PREV 
SAR Ref(SAR(0.02,0.2),-1) Filter When(colA > colB) AND 
When(colC > colA)   Filter 
enabled Yes Periodicity Daily Records 
required 6 
The message that I get is:-
Filter reference to N/A value in column 
B
 
Tks in advance
 
Kush