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Re: st: variable in red


From   Inés Rodríguez <irodriguez@udesa.edu.ar>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: variable in red
Date   Fri, 7 Mar 2008 14:08:27 -0200 (ARST)

I´m very grateful to you


> --- Inés Rodríguez <irodriguez@udesa.edu.ar> wrote:
>> > What mean when a variable appears in red?
>
> --- Chiara Mussida <cmussida@gmail.com> wrote:
>> if it is red into the data editor it means that it is considered as
>> "string" variable and stata does not allow any regression with
>> variable expressed in this way
>
> Strings are basically letters, and Stata can do very little math with
> letters (how much is a + b?), which is why you cannot directly enter a
> string variable into for instance -regress-, as Chiara noted. However,
> a string variable often identifies different groups, i.e. represents a
> categorical variable. If this is the case you can use it in regression
> by using the -xi- prefix. Alternatively you can turn it into a numeric
> variable (give each category a number, and attach a the string to it
> using a value label) using -encode-.
>
> Hope this helps,
> Maarten
>
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting address:
> Buitenveldertselaan 3 (Metropolitan), room Z434
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
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