st: Replacing missing values only works one way?

[Dana Chandler <dchandler@gmail.com>]

The command described here works fine when I go one way: replace myvar
= myvar[_n-1] if myvar >= .

However, when I try to replace in the other direction replace myvar =
myvar[_n+1] if myvar >= ., it doesn't work and I have to repeat the
command for each time I want it to copy... Does anyone have any
suggestions?

I've read the below, but it doesn't quite make sense.

http://www.stata.com/support/faqs/data/missing.html
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