I've just started learning Stata syntax after long years of SAS use and am
completely stumped by a result. I want to create a new 4-level variable
(ascertgp) based on the crosstabulation of 2 dichotomous variables (probip
and promig). This is the syntax I wrote:
if probip==1 & promig==1 {
gen ascertgp=1
}
else if probip==0 & promig==1 {
gen ascertgp=2
}
else if probip==1 & promig==0 {
gen ascertgp=3
}
else if probip==0 & promig==0 {
gen ascertgp=4
}
When I run tab1 ascertgp I get a value of 3 for every observation. (I
know what the 4 frequencies should be from the crosstab.) I must be doing
something very obviously wrong, but can see what it is.
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