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Re: Calculating fertility rates [message #207 is a reply to message #107]

Tue, 26 March 2013 16:22

Reduced-For(u)m
Messages: 292
Registered: March 2013

Senior Member

Not sure if these suggestions will help, but thought I'd mention a couple of tricky parts.

First, did you divide all the weights by 1000000? It shouldn't make much of a difference, but I think it could lead to mathematically slightly different answers if Stata is trying to deal with really big weight numbers. Also, how are you actually weighting these? (I don't really know exactly how you should, other than it might involve the all woman factor, but seems like you'd have to re-calculate the denominator and numerator by summing across woman-years times weight instead of just the woman-years).

Second, getting the timing so that women-years are properly balanced between age-groups is tricky. The DHS method seems to truncate age to age-in-round-years, so maybe you are rounding differently than they do.

Third, there is another approach to calculating TFRs (and age-specific rates) that is a "person period" approach. You can find a discussion here http://paa2012.princeton.edu/papers/122446 but I don't think the package is totally ready yet (once it is, that will be handy). This will almost certainly not return the DHS numbers, and the interpretation is probably slightly different, but it's not clear to me that the DHS numbers are in any sense "better" than what you'd get from this method.

In general, it seems to be pretty hard to get exactly the numbers that the DHS gets. If yours are not meaningfully different (economically/epidemilogically/etc) from the published ones, it might just be an alogrythm thing about how Stata computes things and uses weights.

If you post a .do file, I might be able to take a look. I've found the process difficult myself, and maybe I could learn something from how you are trying to do it. Hope something here was helpful.

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[Message index]

		Calculating fertility rates By: DHS user on Tue, 26 February 2013 09:55
		Re: Calculating fertility rates By: Reduced-For(u)m on Tue, 26 March 2013 16:22
		Re: Calculating fertility rates By: schoumaker on Thu, 30 May 2013 09:51
		Re: Calculating fertility rates By: amaustin on Wed, 25 February 2015 12:16
		Re: Calculating fertility rates By: schoumaker on Fri, 27 February 2015 03:19
		Re: Calculating fertility rates By: amaustin on Fri, 27 February 2015 11:28
		Re: Calculating fertility rates By: Trevor-DHS on Fri, 27 February 2015 13:52
		Re: Calculating fertility rates By: annfitz on Tue, 26 May 2015 12:25
		Re: Calculating fertility rates By: schoumaker on Tue, 26 May 2015 14:34
		Re: Calculating fertility rates By: mianrashid on Mon, 19 September 2016 04:38
		Re: Calculating fertility rates By: Liz-DHS on Mon, 19 September 2016 08:51
		Re: Calculating fertility rates By: schoumaker on Mon, 19 September 2016 09:00
		Re: Calculating fertility rates By: Kirwana Venantius Bbaale on Mon, 24 October 2016 04:09
		Re: Calculating fertility rates By: schoumaker on Mon, 24 October 2016 04:12
		Re: Calculating fertility rates By: Kirwana Venantius Bbaale on Mon, 24 October 2016 07:41
		Re: Calculating fertility rates By: schoumaker on Mon, 24 October 2016 07:42
		Re: Calculating fertility rates By: Kirwana Venantius Bbaale on Mon, 24 October 2016 09:26
		Re: Calculating fertility rates By: schoumaker on Mon, 24 October 2016 09:34
		Re: Calculating fertility rates By: schoumaker on Mon, 24 October 2016 10:00
		Re: Calculating fertility rates By: Kirwana Venantius Bbaale on Mon, 24 October 2016 11:02
		Re: Calculating fertility rates By: Kirwana Venantius Bbaale on Mon, 24 October 2016 11:04
		Re: Calculating fertility rates By: Kirwana Venantius Bbaale on Tue, 25 October 2016 06:19
		Re: Calculating fertility rates By: schoumaker on Tue, 25 October 2016 06:54
		Re: Calculating fertility rates By: rajaram on Mon, 09 October 2017 02:31
		Re: Calculating fertility rates By: schoumaker on Mon, 09 October 2017 02:42
		Re: Calculating fertility rates By: rajaram on Tue, 10 October 2017 05:17
		Re: Calculating fertility rates By: Jayanta on Tue, 21 August 2018 10:32
		Re: Calculating fertility rates By: adasgupta on Mon, 12 August 2019 05:10
		Re: Calculating fertility rates By: schoumaker on Mon, 12 August 2019 10:34
		Re: Calculating fertility rates By: DikshaJha on Thu, 16 February 2023 08:45
		Re: Calculating fertility rates By: schoumaker on Thu, 16 February 2023 09:19
		Re: Calculating fertility rates By: DikshaJha on Thu, 16 February 2023 09:49
		Re: Calculating fertility rates By: DikshaJha on Tue, 08 August 2023 05:33
		Re: Calculating fertility rates By: Janet-DHS on Tue, 15 August 2023 11:59
		Re: Calculating fertility rates By: Astride on Sun, 17 March 2024 11:50
		Re: Calculating fertility rates By: schoumaker on Mon, 18 March 2024 05:20
		Re: Calculating fertility rates By: Astride on Mon, 18 March 2024 08:58
		Re: Calculating fertility rates By: schoumaker on Mon, 18 March 2024 13:38

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