I�m very grateful to you
> --- In�s Rodr�guez <[email protected]> wrote:
>> > What mean when a variable appears in red?
>
> --- Chiara Mussida <[email protected]> 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/
> -----------------------------------------
>
>
> __________________________________________________________
> Sent from Yahoo! Mail.
> The World's Favourite Email http://uk.docs.yahoo.com/nowyoucan.html
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
