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From |
Erik Lenguerrand <[email protected]> |

To |
[email protected] |

Subject |
Re: st: Using the format of a variable to trigger different command |

Date |
Thu, 26 Jul 2012 12:14:37 +0100 |

This is exactly what I need! Many thanks Maarten! BW Erik --On 26 July 2012 12:34 +0200 Maarten Buis <[email protected]> wrote:

On Thu, Jul 26, 2012 at 12:04 PM, Erik Lenguerrand <[email protected]> wrote:I would like to use the "foreach varlist" command to loop over a large list of variables to automate a listing of descriptive statistics. However the statistical tool to use should depend on the nature of the variable. (ie tab command for categorical variables and sum command for continuous variables) I am wondering if there is a stata command to identify the variable format, ie something which will generate a binary outcome like 1 if is it continuous variable and 0 if not.Stata does not have the concept of continuous versus categorical variable. However, you can define a categorical variable as containing either only strings or only integers and having a limited number of categories, and than create a Stata program that checks that. Below is a quick stab at such a program: *----------------- begin example --------------------- clear all program define iscat, rclass version 12.1 syntax varname [if] [in], [ kmax(integer 20) ] marksample touse // check if string capture confirm string variable `varlist' if !_rc { return scalar iscat = 0 exit } // check if intger capture assert mod(`varlist',1) == 0 if `touse' if _rc { return scalar iscat = 0 exit } //check number of categories qui levelsof `varlist' if `touse' local k : word count `r(levels)' if `k' > `kmax' { return scalar iscat = 0 exit } else { return scalar iscat = 1 exit } end // try it out on some example data sysuse auto iscat rep78 return list iscat mpg return list iscat foreign return list iscat headroom return list iscat make return list *------------------ end example ---------------------- Hope this helps, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

---------------------- Erik Lenguerrand, MSc, PhD Medical Statistician [email protected] School of Clinical Science Bristol Implant Research Centre/RISQ Unit Lower Level, Avon Orthopaedic Center Southmead Hospital Westbury-on-Trym Bristol BS10 5NB * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Using the format of a variable to trigger different command***From:*Erik Lenguerrand <[email protected]>

**Re: st: Using the format of a variable to trigger different command***From:*Maarten Buis <[email protected]>

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