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Re: Where can I find z-scores? [message #2548 is a reply to message #2546]

Thu, 10 July 2014 13:20

Trevor-DHS
Messages: 802
Registered: January 2013

Senior Member

Hi Giacomo,

A couple of notes for you:
1) You don't need to compute the z-scores for older rounds of data. The Z-scores for the older rounds of surveys are available in separate data files that can be downloaded. These are the HW (Height and Weight scores) files, for example for Benin 2001 the file is BJHW41xx.zip (where xx is the type of data file).
2) The reason you are not matching the z-scores in the DHS data is because of the calculation of age used in the computation of the Z-scores. HW1 only gives age rounded off to the month, but in the calculation of the z-scores we compute age to the day, as follows:

* Calculate measurement date in days
gen mdate = mdy(hw18, hw17, hw19)
* Calculate birth date in days
gen bdate = mdy(b1, hw16, b2) if hw16 <= 31
replace bdate = mdy(b1, 15, b2) if hw16 > 31
* Calculate age in months with days expressed as decimals.
gen age = (mdate-bdate)/30.4375
* Compute Z-scores
zscore06, a(age) s(b4) h(hw3_2) w(hw2_2)

Note, though that the zscore06 software does not handle some of the flagging of data that we do, so you will find some differences related to flagged cases and to cases where the data of birth was imputed (where b10 != 1).

I hope this helps.

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[Message index]

		Where can I find z-scores? By: DHS user on Mon, 18 February 2013 16:46
		Re: Where can I find z-scores? By: Liz-DHS on Thu, 21 February 2013 10:11
		Re: Where can I find z-scores? By: Kwesi.Nkrumah on Mon, 18 March 2013 20:04
		Re: Where can I find z-scores? By: mdma0011 on Fri, 22 March 2013 16:22
		Re: Where can I find z-scores? By: Reduced-For(u)m on Sat, 30 March 2013 00:14
		Re: Where can I find z-scores? By: alimnoushad on Sat, 30 March 2013 05:12
		Re: Where can I find z-scores? By: habt_lancs on Fri, 14 July 2017 06:34
		Re: Where can I find z-scores? By: Reduced-For(u)m on Mon, 18 March 2013 16:42
		Re: Where can I find z-scores? By: Trevor-DHS on Mon, 18 March 2013 17:29
		Re: Where can I find z-scores? By: habt_lancs on Fri, 14 July 2017 06:40
		Re: Where can I find z-scores? By: Trevor-DHS on Fri, 14 July 2017 11:30
		Re: Where can I find z-scores? By: habt_lancs on Fri, 14 July 2017 11:39
		Re: Where can I find z-scores? By: habt_lancs on Fri, 14 July 2017 12:28
		Re: Where can I find z-scores? By: Trevor-DHS on Fri, 14 July 2017 14:01
		Re: Where can I find z-scores? By: habt_lancs on Fri, 14 July 2017 14:11
		Re: Where can I find z-scores? By: habt_lancs on Thu, 14 September 2017 11:17
		Re: Where can I find z-scores? By: Trevor-DHS on Thu, 14 September 2017 12:28
		Re: Where can I find z-scores? By: habt_lancs on Thu, 14 September 2017 13:22
		Re: Where can I find z-scores? By: Trevor-DHS on Thu, 14 September 2017 13:26
		Re: Where can I find z-scores? By: habt_lancs on Wed, 13 December 2017 12:02
		Re: Where can I find z-scores? By: Liz-DHS on Thu, 24 May 2018 16:24
		Re: Where can I find z-scores? By: habt_lancs on Thu, 14 September 2017 13:27
		Re: Where can I find z-scores? By: giacomo on Thu, 10 July 2014 10:01
		Re: Where can I find z-scores? By: Trevor-DHS on Thu, 10 July 2014 13:20
		Re: Where can I find z-scores? By: giacomo on Thu, 10 July 2014 13:32
		Re: Where can I find z-scores? By: Gowokani on Wed, 03 May 2017 09:42
		Re: Where can I find z-scores? By: Trevor-DHS on Wed, 03 May 2017 13:15
		Re: Where can I find z-scores? By: Gowokani on Mon, 08 May 2017 07:07
		Re: Where can I find z-scores? By: Trevor-DHS on Mon, 08 May 2017 10:35
		Re: Where can I find z-scores? By: Gowokani on Mon, 08 May 2017 10:42
		Re: Where can I find z-scores? By: alohciN on Tue, 24 September 2019 13:18
		Re: Where can I find z-scores? By: Trevor-DHS on Tue, 24 September 2019 14:21
		Re: Where can I find z-scores? By: alohciN on Wed, 25 September 2019 06:53
		Re: Where can I find z-scores? By: Trevor-DHS on Wed, 25 September 2019 10:05
		Re: Where can I find z-scores? By: alohciN on Wed, 25 September 2019 12:40
		Calculating Z-scores By: hussainulahmad@gmail.com on Sun, 24 June 2018 09:14
		Re: Calculating Z-scores By: Trevor-DHS on Wed, 27 June 2018 16:08
		Re: Calculating Z-scores By: Trevor-DHS on Wed, 27 June 2018 17:09
		Re: Where can I find z-scores? By: Trevor-DHS on Wed, 25 September 2019 16:44
		Re: Where can I find z-scores? By: alohciN on Wed, 25 September 2019 17:17
		Re: Where can I find z-scores? By: Trevor-DHS on Wed, 25 September 2019 18:26
		Re: Where can I find z-scores? By: Trevor-DHS on Wed, 25 September 2019 18:27
		Re: Where can I find z-scores? By: alohciN on Thu, 26 September 2019 07:07
		Re: How to convert mother's height in the DHS to feet By: alohciN on Thu, 31 October 2019 12:30
		Re: How to convert mother's height in the DHS to feet By: Trevor-DHS on Thu, 31 October 2019 15:03

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