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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

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

Subject |
st: RE: RE: generate sum of variables & ignore missing |

Date |
Thu, 5 Jun 2008 13:55:28 +0100 |

A solution from first principles is gen total = 0 qui foreach v of var varA varB varC { replace total = total + `v' if !missing(`v') } Notice that -total- ends up with 0 if all are missing. Suppose you want missing if all are missing the total of non-missings otherwise That is only a little more complicated. gen total = . qui foreach v of var varA varB varC { replace total = cond(missing(total), `v', total + `v') if !missing(`v') } Nick n.j.cox@durham.ac.uk Martin Weiss egen varD=rowtotal(varA - varC) Andrea Bennett I have 3 columns (varA, varB, varC) containing dummy variables (0, 1, missing values "."). I would like to generate "varD" the sum of each row, e.g. if varA==1 varB==0 varC==1 I should have varD==2. This works clearly fine when there are no missing values (varD= varA + varB + varC). But is there an easy way to let Stata read a missing value as "0" so that varA==1 varB==. varC==1 would result in varD==2 (without actually replacing the missing values with "0")? I am trying to get it to work with -missing()- but so far have not succeeded. * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: RE: RE: generate sum of variables & ignore missing***From:*Andrea Bennett <mac.stata@gmail.com>

**References**:**st: generate sum of variables & ignore missing***From:*Andrea Bennett <mac.stata@gmail.com>

**st: RE: generate sum of variables & ignore missing***From:*"Martin Weiss" <martin.weiss@uni-tuebingen.de>

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