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From |
Nick Cox <njcoxstata@gmail.com> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
Re: st: nested loop for mean and median |

Date |
Mon, 29 Apr 2013 15:26:19 +0100 |

Lots of problems here. Some arise from just not reading the documentation. 1. What is throwing you out is a type mismatch. At a guess, one or more of -fyear- -sic- -country- is actually a string variable. I can't tell you which: look at -describe-. 2. -summarize- does not calculate the median except with the -detail- option. When it does it saves it as r(p50). Why did you type r(median)? 3. For each variable, second time round the second loop gen mean_Assets = ... for example will fail because the variable already exists. Something like this is much easier: foreach v in Assets Liab Income { egen mean_`v' = mean(`v'), by(country year sic) egen median_`v' = median(`v'), by(country year sic) } Nick njcoxstata@gmail.com On 29 April 2013 15:15, Nahla Betelmal <nahlaib@gmail.com> wrote: > Dear Statalis, > > I need to get the mean and median for some firms in a certain year > (2000-2012) and certain industry (73 industries). e.g. the mean and > median for assets for the firms operate in industry 6 in year 2004, > and so on. I tried the following nested loop but I got error (109). > > p.s. I need the mean and median as new variables as they will be used > in further calculations. > > > > > foreach v of var Assets Liab Income { > forval y=2000/2012 { > forval i= 1/73 { > qui su `v' if fyear==`y'& sic==`i'& country==1 > gen mean_`v' = r(mean) > gen median_`v' = r(median) > } > } > } > > type mismatch > r(109); > > > Many thanks > > Nahla Betelmal > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: nested loop for mean and median***From:*Nahla Betelmal <nahlaib@gmail.com>

**References**:**st: nested loop for mean and median***From:*Nahla Betelmal <nahlaib@gmail.com>

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