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st: Problem with replace if - test condition works only for some values of test variable


From   "Naunihal Singh" <naunihal@post.harvard.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Problem with replace if - test condition works only for some values of test variable
Date   Thu, 23 Oct 2008 18:32:27 -0400

Please, indulge me. I'm sure I've overlooked something basic, but
replace if is working only for certain values of the test variable and
not for others.

Start with any dataset open
Here is the code fragment that replicates my problem:

ge y=.
generate x= (_n/100)-0.01 in 1/101
replace y=1 if x==0
replace y=1 if x==.01
replace y=1 if x==.25
replace y=1 if x==.26
replace y=1 if x==.5
replace y=1 if x==.51
replace y=1 if x==.75
replace y=1 if x==.76
replace y=1 if x==1
replace y=1 if x==.99

I'm able to make assignments to y only when x equals 0, .25, .5, .75,
and 1 but for no other value. This is the output I get:

. replace y=1 if x==.5
(1 real change made)

. replace y=1 if x==.51
(0 real changes made)

Why does this happen and how do I fix it? x is a float, so it should
have enough precision for the test condition. And if the test can
recognize .25 it should be able to recognize .26.

Thanks

N
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