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From |
"Austin Nichols" <austinnichols@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Macro and Loop |

Date |
Mon, 8 Sep 2008 13:42:01 -0400 |

Ying Huang <hying@mail.med.upenn.edu>: There are a number of ways of doing this, as I hinted unsuccessfully. Here are two: clear set obs 1000 g byte month=1+mod(_n,12) forv i=1/24 { g v`i'=uniform()<.2 } g m=. forv i=1/12 { egen next12_`i'=rowmax(v`=`i'+1'-v`=`i'+12') qui replace m=next12_`i' if month==`i' drop next12_`i' } g i=_n qui reshape long v, i(i) egen m2=max(v==1 & inrange(_j,month+1,month+12)), by(i) qui reshape wide v, i(i) tab m2 m In the "long" format of data, using by: is often faster than -egen- but you may have to -reshape- twice to use it. On Mon, Sep 8, 2008 at 1:13 PM, Ying Huang <hying@mail.med.upenn.edu> wrote: > Maarten buis wrote: >> >> --- Ying Huang <hying@mail.med.upenn.edu> wrote: >> >>> >>> I have 24 indicator variables (1/0) to indicate insurance coverage in >>> 24 monthes. For example, if the survey is in 1997, then the survey >>> month refer to Jan to Dec of 1997, and those 24 variables show >>> insurance coverage for each month in 97 and 98. >>> >>> The variable I want to create is again a 1/0 variable, say call it >>> "insurance". Starting from the survey month, if any of the following >>> 12 insurance coverage indicators = yes, then insurance =1; otherwise >>> insurance =0. >>> >> >> say that the indicotor variables are called insured1 till insured24, >> then I would type: >> egen insured = rowtotal(insured1-insured12) >> replace insured = insured >0 if insured < . >> >> You may need to think a bit on how you treat missing values (-rowtotal- >> treats a missing value by default as 0) >> >> Hope this helps, >> >> Maarten >> >> > > Maarten, > Thanks a lot for your reply, but what I want to know is not if someone had > coverage for any of all those 24 months. What I want to know is if someone > had coverage from Aug 97 to Aug 98 if he was surveyed in Aug 97. For another > person, the period may go from Nov 97 to Nov 98. The 12-month period varies > from person to person. * * 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**:**Re: st: Macro and Loop***From:*Maarten buis <maartenbuis@yahoo.co.uk>

**Re: st: Macro and Loop***From:*Ying Huang <hying@mail.med.upenn.edu>

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