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Re: st: Mark observations with missing data


From   Richard Herron <richard.c.herron@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Mark observations with missing data
Date   Fri, 6 Jan 2012 13:16:20 -0500

Thanks, Alan! I knew that I had to missing something (here largely
failing to read the manual :) ).

I guess I can really do this in one line -generate byte missing =
missing(mpg, price, rep78)-.

Thanks!

On Fri, Jan 6, 2012 at 13:07, Alan Neustadtl <alan.neustadtl@gmail.com> wrote:
> The missing function might be useful here.  See -help missing()-.  For example:
>
> /* Begin example */
>
> sysuse auto, clear
> gen missvar=0
> replace missvar=1 if missing(rep78, mpg, price)
> list rep78 mpg price missvar
>
> /* End example */
>
> Best, Alan
>
> On Fri, Jan 6, 2012 at 1:00 PM, Richard Herron
> <richard.c.herron@gmail.com> wrote:
>> I learned about -dropmiss- (Stata Journal) from this Stata List post:
>> http://www.stata.com/statalist/archive/2010-05/msg00513.html
>>
>> But I would like to keep all observations and just mark the ones with
>> missing observations in a given -varlist-. This way with an -if-
>> statement I can find summary statistics for the same data that I will
>> later use in regressions. I provide a hackish solution below, but is
>> there a better way? Is there anything flawed with my approach? I am a
>> little wary of loops and my own coding. Thanks!
>>
>> Here is my hackish solution if I want to mark observations with any
>> missing variables.
>>
>> * begin code
>> sysuse auto, clear
>> replace price = . in 1
>> replace mpg = . in 2
>> list in 1/5
>>
>> * hackish solution
>> generate byte complete = 1
>> foreach x of varlist * {
>>    replace complete = 0 if missing(`x')
>> }
>> list in 1/5
>> * end code
>> *
>> *   For searches and help try:
>> *   http://www.stata.com/help.cgi?search
>> *   http://www.stata.com/support/statalist/faq
>> *   http://www.ats.ucla.edu/stat/stata/
>
> *
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