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

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

Subject |
RE: st: creating an array with hospitalization days |

Date |
Tue, 8 Nov 2005 21:24:13 -0000 |

You are right. begin(1)end doesn't qualify, by a long way, as a range acceptable to -forval-. Stata has to be able to work out, immediately, what number you mean by "begin" and what by "end". Also, what goes in those positions _must_ be constants. They cannot be variables. A quite different issue is that I cannot see why you want these 365 extra variables, as they add no information to your data. What do you want to do with them? 9 times out of 10 wanting to do this betrays a traveller from SAS land who wants to do something in a SAS-like way, but I would guess happily that you do not need these 365 variables at all. Nick n.j.cox@durham.ac.uk Maria Montez > Here is the error message: > > . forvalues i=begin(1)end { > 2. replace day`i'=1 > 3. } > invalid syntax > r(198); > > I actually tabulated both begin and end and begin goes from > 1-364 and end > goes from 1-365. I think I cannot use variables in defining > where the loop > should start and end. I did a test by writing > > forvalues i=begin(1)end { > replace day5=1 > } > > and I get the same error. Eric G. Wruck > What was the syntax error? You may have gone past the 365th > element of your > array if you have a discharge day sometime past 1-October-2001, or > thereabouts. > >Hi! I'm still on v8. > > > >I'm looking at one year of data for which one record > corresponds to one > >hospitalization. I created variables day1-day365 to > represent all the days > >in that year. Now, I would like those variables to be equal > to one during > an > >hospitalization. I have the admission day (admitday) and the > discharge day > >(disday) and using these, I created two variables begin and > end that tell > me > >when did that hospitalization started and ended. Then I > though that I could > >loop from begin to end and change the day array from 0 to 1. > However I'm > >getting a syntax error and I think it comes from the begin and end > variables > >in the forvalues loop. Can anyone help me? > > > >sample code: > > > >forvalues i=1(1)365 { > > gen day`i'=0 > >} > > > >gen begin=admitday-mdy(10,1,2000)+1 > >replace begin=1 if begin<=0 > > > >gen end=disday-mdy(10,1,2000)+1 > > > >forvalues i=begin(1)end { > > replace day`i'=1 > >} > > > >sample data: > > > > > +--------------------------------------------------------------+ > > | study_id admitday disday begin end > day1 day2 | > > > |--------------------------------------------------------------| > > 1. | 19 03jan2001 24jan2001 95 116 > 0 0 | > > 2. | 362 24may2001 29may2001 236 241 > 0 0 | > > 3. | 396 01jun2001 07jun2001 244 250 > 0 0 | > > 4. | 436 21mar2001 22mar2001 172 173 > 0 0 | > > 5. | 438 17jan2001 25jan2001 109 117 > 0 0 | > > > |--------------------------------------------------------------| > > 6. | 517 06mar2001 21mar2001 157 172 > 0 0 | > > 7. | 517 11sep2001 17sep2001 346 352 > 0 0 | > > 8. | 590 16sep2001 17sep2001 351 352 > 0 0 | > > 9. | 879 20dec2000 22dec2000 81 83 > 0 0 | > > > +--------------------------------------------------------------+ > * * 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: creating an array with hospitalization days***From:*"Maria Montez" <montez@bu.edu>

**RE: st: creating an array with hospitalization days***From:*"Maria Montez" <montez@bu.edu>

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