notes Nuptiality Models - Eco 572 Research methods in...

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Eco 572: Research methods in Demography Nuptiality Models We apply nuptiality models to age at marriage in Colombia using WFS data. The main objective is to show the use of models to extrapolate from incomplete cohort experience. The Data We read an extract with age at interview and age at marriage for the cohort 35-39 in the Colombia WFS. . use , clear (COSR02 extract) . desc Contains data from obs: 579 COSR02 extract vars: 2 26 Mar 2006 12:53 size: 3,474 (99.9% of memory free) ------------------------------------------------------------------------------- storage display value variable name type format label variable label ------------------------------------------------------------------------------- v010 byte %8.0g Age in completed years v109 byte %8.0g v109 Age at first union ------------------------------------------------------------------------------- Sorted by: We treat women married at their current age as single at the start of the year, thereby avoiding assumptions about partial exposure, and then group the data . replace v109 = . if v109 >= v010 (74 real changes made, 74 to missing) . gen n=1 . rename v010 age . rename v109 agemar . collapse (sum) n, by (age agemar) Modeling the Complete Experience We want to plot proportions ever married and first marriage frequencies for each of the single-year cohorts aged 35 to 39, together with fitted Coale-McNeil and Hernes models. We start by computing the observed frequencies (1 of 5) [2/12/2008 10:41:50 AM]
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Eco 572: Research methods in Demography . egen N = sum(n), by(age) . gen f = n/N if !missing(agemar) (5 missing values generated) . bysort age (agemar): gen F = sum(f)-f (5 missing values generated) Next we compute cumulative model schedules. The estimates for the Coale-McNeil model were obtained
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