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From |
Michael Stewart <[email protected]> |

To |
statalist <[email protected]> |

Subject |
st: Need Help with Stata Programming |

Date |
Tue, 7 Jan 2014 02:00:26 -0500 |

Hello , I have a question regarding lists and have read Nick's paper on lists and counting irregularly spaced intervals. I posted a similar, but different question http://www.stata.com/statalist/archive/2013-11/msg00882.html previously. My dataset is as follows ***********DATASET-BEGIN************************** ID VISITDATE EVENT LOCATION 1 Jan_1 May_1 1 1 Jan_4 May_1 2 1 Jan_6 May_1 1 1 May_5 May_1 1 1 May_8 May_1 2 2 Feb_2 Feb_9 2 2 Feb_6 Feb_9 2 2 Feb_15 Feb_9 1 2 Feb_27 Feb_9 2 2 Mar_30 Feb_9 2 ***********DATASET_END**************************** MY NEED: I am trying to generate the following two variables and looking to see if the programmers in the statalist may help me. 1) ***** for this variable, can you suggest an shorter/more elegant ******** VAR_1: this varaible shows VISITDATE when the LOCATION was the first "2" [this is somewhat easier] Ex: For patient 1(ID=1), visit date corresponding to first 2 (in location) would be Jan 4 For patient 2(ID=2), visit date corresponding to first 2 (in location) would be Feb 2 *************code begin******************* bysort ID (VISITDATE): gen VAR_1=VISITDATE if LOCATION==2 bysort ID (VAR_1): gen LOCATION_FIRST2=VAR_1[1] ************code end************************ 2)**********I do not know how to generate the following variable ****************** VAR_2: this variable shows VISITDATE when the LOCATION is the second 2 Ex: For patient 1(ID=1), visit date corresponding to second 2 (in location) would be May 8 For patient 2(ID=2), visit date corresponding to second 2 (in location) would be Feb 6 Thank you very much for your time and consideration. -- Thank you , Yours Sincerely, Mike. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Need Help with Stata Programming***From:*Nick Cox <[email protected]>

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