Primary sampling units (PSU) [message #1313] |
Tue, 11 February 2014 23:49 |
joyp
Messages: 5 Registered: January 2014
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Dear users,
I would like to check the number of PSUs in round 1, round 2 and round 3. I was looking at variable (V021).
In NHFS3, it corresponds to 3850 PSUs reported in the final report (I understand that it has been randomised, but it takes as many unique values).
But in earlier rounds (NFHS 2 and NFHS 1) I have much fewer unique values for this variable.
According to the final reports, NFHS 2 should have 3165 PSUs and NFHS 1 should have 3522 area units. So I am thinking that V021 should have as many unique values.
Can anyone please confirm this? Or am I missing something?
Many thanks,
Jaai
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Re: Primary sampling units (PSU) [message #1363 is a reply to message #1313] |
Mon, 17 February 2014 23:24 |
Liz-DHS
Messages: 1516 Registered: February 2013
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Senior Member |
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Dear User,
Here is a response from one of our experts, Fred Arnold:
The PSU numbers are unique within a single state, but they repeat across states, so you should look at the state code in conjunction with the PSU numbers when trying to determine how many PSUs there are.
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Re: Primary sampling units (PSU) [message #3049 is a reply to message #3047] |
Tue, 07 October 2014 11:39 |
Liz-DHS
Messages: 1516 Registered: February 2013
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Senior Member |
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Here is another response from one of our experts, Fred Arnold:
If you're using data for only a single state, you can use just the PSU number, but if you're using data across states or for the whole country you need to combine the state and PSU codes in order to obtain a unique code for each PSU. For example, every state will have a PSU=001 so that PSU code is not unique. If you add the PSU code at the end of the state code you will have a unique variable. For example, PSU 001 in state 22 will have the unique PSU number of 22001. PSU 001 in state 24 will have the unique PSU number of 24001. One way to generate the unique codes is to create a new variable, which =1,000*state code + PSU code.
Thank you for your post.
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Re: Primary sampling units (PSU) [message #12124 is a reply to message #3268] |
Thu, 30 March 2017 10:41 |
kbietsch
Messages: 14 Registered: November 2015 Location: Washington, DC USA
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Member |
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Hello Trevor,
I am looking for the strata variable (or which to combine to construct one). You suggest v022, but looking at the data file, this variable is missing. According to the sampling framework described in the final report (volume 2), the NFHSIII is not a 2 stage cluster sample, has both 2 and 3 stages (in rural and urban areas, respectively).
This is the code I generally use for analyzing DHS data (in R) with strata of urban/rural.
df$sampleweights <- df$v005/1000000
design <- svydesign(ids=~v021+v002, strata=~v025, weights=~sampleweights, data=df)
How do you set the strata design for NFHSIII?
Thank you,
Kristin
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