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Re: st: Command for selecting values


From   Clarice Martins <martins.clarice@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Command for selecting values
Date   Wed, 30 Oct 2013 12:06:32 -0200

Thanks Nick!

I will review your suggestion and loved "the introductory" review -- I will review all that before posing any further question.

Clarice


On Oct 30, 2013, at 11:32 AM, Nick Cox wrote:

> . bysort co_id (quintile) : replace quintile = quintile[1]
> 
> lets you "spread" the non-missing values of -quintile- to all
> observations for each company. You can then select appropriate
> companies freely.
> 
> For an introductory review of several tricks in this territory, see
> 
> SJ-11-2 dm0055  . . . . . . . . . . . . . .  Speaking Stata: Compared with ...
>        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
>        Q2/11   SJ 11(2):305--314                                (no commands)
>        reviews techniques for relating values to values in other
>        observations
> 
> Nick
> njcoxstata@gmail.com
> 
> 
> On 30 October 2013 13:04, Clarice Martins <martins.clarice@gmail.com> wrote:
> 
>> I am using Stata 12.1 for Mac.
>> 
>> My problem is:
>> - within a dataset (with the structure below), I need to -if rtype=="formation" & yrmonth == "`lev'" & quintile==1- , pick values from -rtype==buysell- but from same companies that are in the -if- selection.
>> 
>> I thought of something like this for a code:
>> 
>> *-------begin code------
>> gen P1_sell = .
>> levelsof yrmonth, local(levs)
>> 
>> 
>> foreach lev of local levs {
>>        egen OK = anymatch(co_id) values (if rtype=="formation" & yrmonth == "`lev'" & quintile==1) //na aceita if ai dentro
>>        replace P1_sell = return if rtype=="buysell" & yrmonth == "`lev'" & co_id = anymatch(OK)
>>        drop temp
>> }
>> *-------end code------------
>> 
>> But I know there is something missing to tell the code to pick values from other observations. I have been researching similar cases on the net, but no luck yet.
>> 
>> Can anyone give me a hint???
>> 
>> Thank you very much,
>> Clarice
>> 
>> *----dataset sample----
>> clear
>> input byte co_id str4 ticker str10 rtype str10 yrmonth double return byte quintile
>> 1 ABCB formation jun2000 0.01 1
>> 1 ABCB formation jul2000 0.01 1
>> 1 ABCB formation aug2000 0.01 1
>> 1 ABCB buysell jul2000 0.01 .
>> 1 ABCB buysell aug2000 0.01 .
>> 1 ABCB buysell sep2000 0.01 .
>> 1 ABCB holding jan2001 0.01 .
>> 1 ABCB holding feb2001 0.01 .
>> 1 ABCB holding mar2001 0.01 .
>> 2 AEDU formation jun2000 0.01 2
>> 2 AEDU formation jul2000 0.01 2
>> 2 AEDU formation aug2000 0.01 2
>> 2 AEDU buysell jul2000 0.01 .
>> 2 AEDU buysell aug2000 0.01 .
>> 2 AEDU buysell sep2000 0.01 .
>> 2 AEDU holding jan2001 0.01 .
>> 2 AEDU holding feb2001 0.01 .
>> 2 AEDU holding mar2001 0.01 .
>> 3 AMBV formation jun2000 0.01 3
>> 3 AMBV formation jul2000 0.01 3
>> 3 AMBV formation aug2000 0.01 3
>> 3 AMBV buysell jul2000 0.01 .
>> 3 AMBV buysell aug2000 0.01 .
>> 3 AMBV buysell sep2000 0.01 .
>> 3 AMBV holding jan2001 0.01 .
>> 3 AMBV holding feb2001 0.01 .
>> 3 AMBV holding mar2001 0.01 .
>> 4 FFFF formation jun2000 0.01 4
>> 4 FFFF formation jul2000 0.01 4
>> 4 FFFF formation aug2000 0.01 4
>> 4 FFFF buysell jul2000 0.01 .
>> 4 FFFF buysell aug2000 0.01 .
>> 4 FFFF buysell sep2000 0.01 .
>> 4 FFFF holding jan2001 0.01 .
>> 4 FFFF holding feb2001 0.01 .
>> 4 FFFF holding mar2001 0.01 .
>> 5 BBBB formation jun2000 0.01 5
>> 5 BBBB formation jul2000 0.01 5
>> 5 BBBB formation aug2000 0.01 5
>> 5 BBBB buysell jul2000 0.01 .
>> 5 BBBB buysell aug2000 0.01 .
>> 5 BBBB buysell sep2000 0.01 .
>> 5 BBBB holding jan2001 0.01 .
>> 5 BBBB holding feb2001 0.01 .
>> 5 BBBB holding mar2001 0.01 .
>> 6 MMMM formation jun2000 0.01 .
>> 6 MMMM formation jul2000 0.01 .
>> 6 MMMM formation aug2000 0.01 .
>> 6 MMMM buysell jul2000 0.01 .
>> 6 MMMM buysell aug2000 0.01 .
>> 6 MMMM buysell sep2000 0.01 .
>> 6 MMMM holding jan2001 0.01 .
>> 6 MMMM holding feb2001 0.01 .
>> 6 MMMM holding mar2001 0.01 .
>> end
>> *-------end--------
>> 
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