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Re: st: filter string variable

From   Nick Cox <>
Subject   Re: st: filter string variable
Date   Mon, 25 Mar 2013 11:12:01 +0000

You can select _string variables_ that contain text such as "agri" by

... if strpos(mystrvar, "agri")

and by extension by you can select such _observations_.  The function call

strpos(string, "text")

returns a positive number (meaning true) if the starting position of
"text" is 1 or more, and is thus a check on "text" being included.

Otherwise it returns zero, meaning false

To understand this, type

. display strpos("this is an example", "example")

. display strpos("this is not", "example")


On Mon, Mar 25, 2013 at 11:02 AM, victor <> wrote:

> I have a dataset which contains the amount of contributions from various
> lobbies to a member of congress. However, for my research I am only
> interested in the contributions from the agricultural lobby. Therefore, I
> would like to filter in a way that keeps only the observations which contain
> words like “agri” or “farm” etc. in it. Since I have to do this for various
> members of congress on several occasions I would like to make some sort of
> code for it. So far I am unable to work something out.

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