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From |
Ulrich Kohler <[email protected]> |

To |
[email protected] |

Subject |
Re: st: splitting columns |

Date |
Thu, 28 Nov 2002 08:59:25 +0000 |

My strategy would be to generate a string-variable and use the string-function -index(s1,s2)-. The following might work (not tested): foreach var of varlist Q1 Q2 Q3 { /* Starts a loop over vars */ gen str1 `var's= "" /* empty string var */ replace `var's = string(`var') /* Fill string with contents */ forval i=1/7 { gen `var'_`i' = index(`var's,"1") ~= 0 /* var=1 if val exists, else 0 */ } } (This works already for seven choices. You might replace Q1 Q2 Q3 with the names of the 80 variables.) regards Katsuhide Isa wrote > I have a survey data which has the following structure. > Each column contains the result of a survey question > that allows MA(multiple answer). > > * data1 > Q1 Q2 Q3 Q4 > 1 1 1 $B!D(B > 2 2 2 > 3 3 12 > 12 4 1 > 13 5 1 > 23 12 2 > 123 24 1 > 13 14 2 > 23 125 12 > 2 234 1 > $B!D(B $B!D(B $B!D(B > > In the example above, Q1 has three choices, > Q2 five choices, and Q3 two choice. > But, it should have been typed as below: > > * data2 > Q1_1 Q1_2 Q1_3 Q2_1 ... > 1 0 0 1 > 0 1 0 0 > 0 0 1 0 > 1 1 0 0 > 1 0 1 0 > 0 1 1 1 > 1 1 1 0 > 1 0 1 1 > 0 1 1 1 > 0 1 0 0 > $B!D(B $B!D(B $B!D(B > Q1_1 indecates the 1st choice of Q1, Q1_2 the 2nd > choice, and so on. > That is, I'd like each variable to take on one if a > relevant choice is selected. > > The question is, is it possible to convert the data1 into > data2 from within Stata? > One immediate solution would be to create new > variables using -generate- as below (in the case of > three choices): > > gen Q1_1 = 1 if Q1 == 1 | Q1 == 12 | Q1 == 13 | Q1 == 123 > gen Q1_2 = 1 if Q1 == 2 | Q1 == 12 | Q1 == 23 | Q1 == 123 > gen Q1_3 = 1 if Q1 == 3 | Q1 == 13 | Q1 == 23 | Q1 == 123 > > But this method is rather troublesome(the maximum > number of choices is seven, and there are as many as > more than 80 questions in the original data!) and easy > to mistype. > I'd like to know if there is some better way to do the > same thing. > > Any suggestions welcome. > Thanks in advance. > > K.I. > > > > > > > > > > > > * > * 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/ > > -- [email protected] http://www.sowi.uni-mannheim.de/lesas * * 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/

**References**:**st: splitting columns***From:*"Katsuhide Isa" <[email protected]>

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