I am trying to create a custom relative strength filter using the following equation. Please help.

pneofotis

This does not seem to be applying any filter criteria:
and [70 < [100 * [[0.4*[close/close(13)] + [0.2*[close/close(26)]*2] + [0.2*[close/close(39)]*3] + [0.2*[close/close(52)]*4]]]]]

Basically the expression should perform the calculation and then only include a ticker whose result is greater than 70.

I think I understand that "close" may not be used with the #of week included in these () but I do not know how to perform this function.

Your assistance would be greatly appreciated.

markd

close(13), close(26), etc. are not valid expressions (not valid functions) in the scan engine's language. You can explore the scan engine's syntax here:

https://support.stockcharts.com/doku.php?id=scans:reference

I'm guessing you mean the close thirteen days ago, or 26 days ago, etc. You would express that

13 days ago close

26 days ago close

etc.

If you make those substitutions and still don't get results you expect, post the entire scan and we (me and others) will take a look.