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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 15:24:52 +0530 |

Hello Svend, 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. 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/

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

**References**:**Re: st: if and if***From:*Svend Juul <SJ@SOCI.AU.DK>

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