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From |
Amanda Fu <mandy.fu1@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: recode 9, 99, 999,..., into missing |

Date |
Sun, 16 May 2010 10:57:10 -0400 |

Hi all, I have seen a couple of times that for some data sets the "not answered" is coded as 9, 99, 999...... and the number of digit of 9 depends on the number of digit of the maximum value of the variable. It is convenient to analyze if recoding them into missing. But the problem is, for some variables, 9 or 99 might be the real values. I was wondering if there is any good way to deal with this kind of recoding. (In the past we have a discussion thread of using the value label information such as "not answered" to deal with this question. What I am asking here is what if there are no such value labels ?) For example, here are three variables : var1 takes values: {1,2,3,4,9} where 9 means "not answered" var2 takes values: {1,2,3,......8,9,10,11,12,99} where 99 means " "not answered" var3 takes values: {1,2,3,...99,100,101,..,150,999} where 999 means " "not answered" var4 takes values: {1,2,3,...999,1000,1001,..5000,9999} where 9999 means " "not answered" Now I am thinking to recode int he following way: foreach var of varlist * { sum `var' replace `var'=. if r(max)<9 & `var'==9 replace `var'=. if r(max)<99 & r(max)>9 & `var'==99 replace `var'=. if r(max)<999 & r(max)>99 & `var'==999 replace `var'=. if r(max)<9999 & r(max)>999 & `var'==9999 } I would like to hear if anyone has better method instead of this. Thanks for your time! Best wishes, Amanda * * 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**:**st: AW: recode 9, 99, 999,..., into missing***From:*"Martin Weiss" <martin.weiss1@gmx.de>

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