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st: Re: search the dataset for a string value


From   Christopher F Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: search the dataset for a string value
Date   Tue, 24 Feb 2004 06:10:54 -0500

On Feb 24, 2004, at 2:33 AM, Paul wrote:

The help on -index- leaves me a bit ignorant.

I use this without knowing how it works:

gen oral = "OVYS" if index(stk,"OVYS")
replace oral = "MICROG" if index(stk, "MICROG")
replace oral ="FEMOD" if index(stk, "FEMOD")
replace oral = "LOGED" if index(stk, "LOGED")

Index 'returns the position' it finds the string'

The position of MICROG could be,  say, 9th character  to 14th in the
string and returns 9-14. How is this translated in a yes?
This function (and most of Stata's string functions) work exactly like those in many programming languages, e.g. c or perl. Since you get a positive return if the substring is found and a zero return if it is not, if(index()) will be true if found, false if not found.

Kit

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