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Re: st: RE: drop observations - if statement


From   Nick Cox <[email protected]>
To   "[email protected]" <[email protected]>
Subject   Re: st: RE: drop observations - if statement
Date   Thu, 6 Mar 2014 01:25:21 +0000

No. Missing for strings has meant empty strings "", and vice versa,
since the beginning of strings.

Nick
[email protected]

On 5 March 2014 22:56, Andrew Maurer <[email protected]> wrote:

> Are you using an older version of Stata? Didn't you use to have to manually force strings to the appropriate length? Eg count if cusip == "          " (10 spaces).


R Zhang

> I used the following commands to drop observations based on a string
> variable - CUSIP- that takes missing values, i.e. delete observations
> with missing CUSIP,
>
> drop if cusip==""
>
> cusip is str10
>
> (0 observations deleted)
>
> could you explain why "(0 observations deleted)"?
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