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From |
"Eva Poen" <eva.poen@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: if not iffing in ado |

Date |
Thu, 9 Oct 2008 09:18:30 +0100 |

Paul, please always include where you got user written commands from when posting to the list. The -swapval- I found is by Nick Cox and can be found on ssc. Note that -swapval-'s [in] syntax is non-standard. Now, I'm not sure what you want to achieve with your if statement. Your syntax reads syntax [if] but then you don't make use of `if' anywhere in your program. Later you test it with local s=1 swap if `s' ==1 However, this is not going to work for two reasons: a) you didn't make use of `if' in your program; b) `s' is a local and not a variable. (You are confusing the if qualifier with the -if- programming command). So, here is a solution: program swap version 10 syntax [if] swapval iud1 iud2 `if' swapval r1 r2 `if' swapval se1 se2 `if' end Test it: gen x = uniform() swap if x > 0.5 If you want to use the -if- programming command: local s = 1 if `s' == 1 { swap } HTH, Eva 2008/10/9 Paul O'Brien <paul.obrien@afe2.org.uk>: > i have a small program to temporarily swap variables using swapval. but i > cannot get the 'if' to work. > > program swap > // used to swap treatment and control (iud r and se) > version 10 > syntax [if] > swapval iud1 iud2 > swapval r1 r2 > swapval se1 se2 > ... > end > > . local s=1 > . swap if `s' ==1 > (79 missing values generated) > (84 missing values generated) > > . list r1 r2 in 1 > > +----------+ > | r1 r2 | > |----------| > 1. | 2.8 3 | > +----------+ > > ... > that's fine, but setting s to 0 still produces a swap > > . local s=0 > > . swap if `s' ==1 > (79 missing values generated) > (84 missing values generated) > > . list r1 r2 in 1 > > +----------+ > | r1 r2 | > |----------| > 1. | 3 2.8 | > +----------+ > > dropping the program does not help. > > what am i doing wrong? > > thanks. > > paul > > * > * 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**:**st: if not iffing in ado***From:*"Paul O'Brien" <paul.obrien@afe2.org.uk>

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