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From |
Kenisha Russell <kenisha.russell@framtidsstudier.se> |

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

Subject |
st: re: data creation for hazard regression |

Date |
Fri, 8 Jun 2012 08:50:48 +0000 |

Hi Statalisters, I am trying to create a data set for which I will use hazard regression (events history analysis to demographers). I am currently restructuring my data into person-period format, in order to use hazard regression to examine the propensity of an individual to transition from state x to state y. and one of the variables that I want to use is pregnancy. Because I have the day and month each child was born, after making this date into century month format, I have simply subtracted the 7 months previous to the birth of each child to obtain a variable called pregnancy. In this particular data set the highest recorded parity is 3. See the syntax I have used below. gen CMpregnancy1=. replace CMpregnancy1=CMchild1-7 if CMchild1!=999999 CMchild is the birthdate of the each child is in century month format. After this I then split the data: stsplit pregnancy1, after(CMpregnancy1) at(0) /* We replace values for pregnancy1 so that 0 represents time before that the woman was pregnant and 1 for after the pregnancy*/ replace pregnancy1= pregnancy1+1 replace pregnancy1=0 if CMpregnancy1==. list pid-_st CMpregnancy* pregnancy* in 1/60 This is repeated three times because given the fact that highest parity is = 3, the likelihood of pregnancy is also 3 and all should be taken into account. Although I have written a syntax here and have split the data, my issue is that I am not sure it is correct. Am I required to split the data with each pregnancy? i.e to create a time = before the event (i.e the pregnancy). If I do split the event, if my reasoning is correct I assume I would need to stop each pregnancy at the point where each child is born. Is that correct? If so, How would I do that? Best, Kenisha * * 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**:**Re: st: re: data creation for hazard regression***From:*Austin Nichols <austinnichols@gmail.com>

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