Dirk Nachbar writes:
I have a syntax question and help would be appreciated.
I want to generate a dummy if certain conditions apply,
but it does not seem to work as the early dummy is always 0.
gen early=0
if sex==1 & (anypen1==1 | anypen2==1 | anypen3==1 | anypen4==1 | anypen5==1) & age < 65 {
early=1
}
if sex==2 & (anypen1==1 | anypen2==1 | anypen3==1 | anypen4==1 | anypen5==1) & age < 60 {
early=1
}
---------------------------
The problem is that -if- does not operate value by value.
Rather it assumes -sex- is shorthand for -sex[1]-, that is,
the value of the first observation (in current sort order) of sex.
You must use
gen early = 0
replace early = 1 if sex==1 & (anypen1==1 | anypen2==1 | anypen3==1 | anypen4==1 | anypen5==1) & age < 65
replace early = 1 if sex==2 & (anypen1==1 | anypen2==1 | anypen3==1 | anypen4==1 | anypen5==1) & age < 60
Or, you can consider using the -cond()- function (See Nick Cox's article in the recent Stata Journal)
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