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RE: st: Evaluate if a dataset is empty
From
"Seliger Florian" <[email protected]>
To
"[email protected]" <[email protected]>
Subject
RE: st: Evaluate if a dataset is empty
Date
Thu, 27 Mar 2014 12:01:12 +0000
Thank you Maarten!! It works with my files.
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Maarten Buis
Sent: Donnerstag, 27. März 2014 12:04
To: [email protected]
Subject: Re: st: Evaluate if a dataset is empty
On Thu, Mar 27, 2014 at 11:51 AM, Seliger Florian wrote:
> I want Stata to go through 20,000 small datasets (with a forvalues loop, datasets are indexed accordingly) and evaluate if the dataset is empty or not. About 50% of the datasets are empty meaning that there are no values for any variable.
capture assert _N == 0
if _rc == 0 {
set obs 18
...
}
The logic is that _N is the number of observations in the dataset, so _N == 0 corresponds to an empty dataset. -assert- gives an error message when the statement is values, but -capture- captures these error messages and leaves the return code behind in _rc. No error message corresponds with an return code 0, so _rc == 0 corresponds with an empty dataset.
Hope this helps,
Maarten
---------------------------------
Maarten L. Buis
WZB
Reichpietschufer 50
10785 Berlin
Germany
http://www.maartenbuis.nl
---------------------------------
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