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

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

Subject |
Re: st: RE: identifying highest number of consecutive variables where answer is consistent across observation |

Date |
Thu, 27 Feb 2014 09:10:51 +0000 |

The easiest way I can think of doing this is gen run=0 replace run_15=0 forvalues x=1/93 { local y=`x'+1 capture replace run=run+1 if q`x'==q`y' & !mi(q`x') capture replace run=0 if q`x'!=q`y' & run_15==0 replace run_15=1 if run==14 } That way, commands failing because either q`x' or q`y' doesn't exist will just be ignored. Another way to do it is gen run=0 replace run_15=0 forvalues x=1/93 { local y=`x'+1 capture confirm var q`x' q`y' if _rc == 0 { replace run=run+1 if q`x'==q`y' & !mi(q`x') replace run=0 if q`x'!=q`y' & run_15==0 replace run_15=1 if run==14 } } Some reading up about -capture- and -confirm- would help here. There is a big reservation, however. If you still wanted to check that say -q3- and -q5- are the same when -q4- is omitted (I won't say "missing"!), this code never makes that comparison. You would need more radical rewriting, perhaps like this unab qall : q* tokenize "`qall'" local nq : word count `qall' gen run=0 replace run_15=0 forvalues x=1/`nq' { local y=`x'+1 replace run=run+1 if ``x''==``y'' & !mi(``x'') replace run=0 if ``x''!=``y'' & run_15==0 replace run_15=1 if run==14 } Incidentally, I don't understand why this is written as though -run- didn't exist already but -run_15- does. Nick njcoxstata@gmail.com On 27 February 2014 04:03, Alison El Ayadi <aelayadi@gmail.com> wrote: > Dear Statalisters - > > I have been using the below code to identify the runs of consecutive > variables where answer is consistent across observations (my thanks to > Joe Canner) - > > gen run=0 > replace run_15=0 > forvalues x=1/93 { > local y=`x'+1 > replace run=run+1 if q`x'==q`y' & !mi(q`x') > replace run=0 if q`x'!=q`y' & run_15==0 > replace run_15=1 if run==14 > } > > I now am in the situation where I have received an updated dataset > that excludes certain variables (q4 q33 and others). I wonder if > there is an easy way to tell this program to exclude certain values > but still run consecutively across those variables that are present? > > Thank you! > Alison > * > * 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/

**References**:**st: identifying highest number of consecutive variables where answer is consistent across observation***From:*Alison El Ayadi <aelayadi@gmail.com>

**st: RE: identifying highest number of consecutive variables where answer is consistent across observation***From:*Joe Canner <jcanner1@jhmi.edu>

**Re: st: RE: identifying highest number of consecutive variables where answer is consistent across observation***From:*Alison El Ayadi <aelayadi@gmail.com>

**RE: st: RE: identifying highest number of consecutive variables where answer is consistent across observation***From:*Joe Canner <jcanner1@jhmi.edu>

**Re: st: RE: identifying highest number of consecutive variables where answer is consistent across observation***From:*Alison El Ayadi <aelayadi@gmail.com>

**RE: st: RE: identifying highest number of consecutive variables where answer is consistent across observation***From:*Joe Canner <jcanner1@jhmi.edu>

*From:*Alison El Ayadi <aelayadi@gmail.com>

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