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st: RE: dates in the 'if' condition
From
Nick Cox <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
st: RE: dates in the 'if' condition
Date
Tue, 9 Aug 2011 14:35:20 +0100
One solution is
. keep if string(time, "%tq") == "1997q4"
Logic: "1997q4" is a string. So you need a way to map from the numeric variable to a string. The -string()- function will do that for you.
Nick
[email protected]
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of [email protected]
Sent: 09 August 2011 14:28
To: [email protected]
Subject: st: dates in the 'if' condition
Hi,
I have not used Stata in time-series context before and would like to ask
a rather simple thing. Having the time variable in a %tq format, it displays the date label but the underlying value
is a number. I have tried to condition with the `if' statement referring to the label instead of the underlying value, but to no avail. Is there any way to do so?
Here is an example:
storage display value
variable name type format label variable label
--------------------------------------------------------------------------------------------------------------------------------------
time float %tq
keep if time==1997q4
1997q4 invalid name
r(198);
keep if time=="1997q4"
type mismatch
r(109);
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