Kim Price writes:
> I need to replace some date of birth values that were entered
> incorrectly. The variable dob (V1) is entered as %d. I've
> been using variations on the following and coming up with
> error messages:
>
> replace V1=05sep2046 05sep1946 if id==434
>
> I want to change id 434's date from 05sep2046 to 05sep1946.
Stata numerically carries dates as days elapsed since 1 jan 1960.
I presume you have the dates in this format, as you claim they
use %d.
If so, you need to use the date functions -date()- and -d()-, where
date(s1,s2,n) returns the elapsed date corresponding to string s1;
string s2 specifies order of month (m), day (d), and year (y)
in s1. n gives the upper year for converting two-digit years.
d(l) is a date literal convenience function;
e.g., typing d(2jan1960) is equivalent to typing 1.
to edit the values.
For example, you might say
. replace V1 = date("05sep1946","dmy") if id==434
or, more directly,
. replace V1 = date("05sep1946","dmy") if V1 == d(05sep2046)
Tom
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