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From |
"Ashim Kapoor" <ashimkapoor@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: if and if |

Date |
Thu, 13 Nov 2008 16:20:27 +0530 |

Thanks ! Ashim On Thu, Nov 13, 2008 at 3:55 PM, Johannes Geyer <JGeyer@diw.de> wrote: >> I have a question. Where did you read that the command >> >> if j==1 >> >> will be testing the FIRST observation. I don't think that it is in the >> stata help for if. Could you point me in the right direction here. > > One source would also be: > http://www.stata.com/support/faqs/lang/ifqualifier.html > >>cond would not be useful cos it can do ONLY 2 conditions. I want to be >>able to use it in MANY conditions. Is there a SUPER cond which can do >>that ? > > -cond- can handle more conditions, you simply include other -cond- in the > condition > like in > http://www.stata.com/support/faqs/data/condition.html > > But I am not sure whether this helps to solve your problem. > > Johannes > > > >> >> >> Also I liked your use of the local in that way. I did not think of >> that . Did you read that somewhere too ? >> >> Thank you, >> Ashim. >> >> On Thu, Nov 13, 2008 at 2:10 PM, Svend Juul <SJ@soci.au.dk> wrote: >> > >> > Ashim wrote: >> > >> > I realize that there are 2 kinds if's in Stata. >> > >> > Type 1 : would be something like replace j = 2 if k==2 >> > here the replace in j would happen ONLY in the corresponding >> > observation of k. THIS IS WHAT I WANT. >> > >> > >> > Type 2 : the programming if something like >> > >> > local j >> > >> > if `j'==2 { >> > >> > do something. >> > >> > } >> > >> > ************************************************************** >> > >> > I guess I want to do something which is in between the above 2. >> > >> > I want to say the following : -- >> > >> > replace j=2 if k==2 >> > replace m=2 if k==2 >> > replace n=2 if k==2 >> > >> > in ONE shot. >> > >> > so I try : - >> > ************************************** Block A >> > if k==2 { >> > replace j=2 >> > replace m=2 >> > replace n=2 >> > } >> > ********************************************* >> > This does not work. Because k==2 would mean k==2 in ALL observations. >> > ... >> > >> > =============================================================== >> > >> > Actually the command -if k==2- means k==2 in the FIRST observation. >> > In Stata terms, your type 1 -if- is a qualifier; your type 2 -if- is >> > a command. >> > >> > There is probably no smart way to do what you want. In some cases >> > you might benefit from putting the condition in a macro, like: >> > >> > sysuse auto.dta , clear >> > local X "if foreign==1" >> > replace price = 1 `X' >> > replace weight = 2 `X' >> > >> > Hope this helps >> > Svend >> > __________________________________________ >> > >> > Svend Juul >> > Institut for Folkesundhed, Afdeling for Epidemiologi >> > (Institute of Public Health, Department of Epidemiology) >> > Vennelyst Boulevard 6 >> > DK-8000 Aarhus C, Denmark >> > Phone: +45 8942 6090 >> > Home: +45 8693 7796 >> > Email: sj@soci.au.dk >> > __________________________________________ >> > >> > * >> > * 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/ >> > >> * >> * 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/ > > * > * 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/ > * * 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**:**Re: st: if and if***From:*"Ashim Kapoor" <ashimkapoor@gmail.com>

**Re: st: if and if***From:*Johannes Geyer <JGeyer@diw.de>

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