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Svy command Fri, 15 May 2015 04:09
 erimgina@yahoo.com Messages: 3Registered: April 2015 Location: China Member
Dear all
I am planning to use DHS 2010 data to investigate the relationship between family planning use and increased weight among women using modern methods of family planning, I getting difficult to use svy command in stata, I have read the user mannual and written the command as follows

gen psu= v021
gen wght=v005/1000000
egen strata = group(v022 v023), label
svyset psu [pweight=wght], strata(strata)
svy: mean age

The results that I get is missing some information as shown in the table below, the same problem occur when I do regression analysis
svy: mean age
(running mean on estimation sample)

Survey: Mean estimation

Number of strata = 51 Number of obs = 10139
Number of PSUs = 475 Population size = 10139
Design df = 424

------------------------------------------------------------ --
| Linearized
| Mean Std. Err. [95% Conf. Interval]
-------------+---------------------------------------------- --
age | 28.57465 . . .
------------------------------------------------------------ --
Note: missing standard error because of stratum with single
sampling unit.

Re: Svy command [message #4379 is a reply to message #4369] Sat, 16 May 2015 17:09
 Reduced-For(u)m Messages: 292Registered: March 2013 Senior Member

There are a couple of ways to deal with that. Here is Trevor's comment from a previous thread:

http://userforum.dhsprogram.com/index.php?t=tree&th=1807 &goto=3738&S=343ce2e112b3f15f2b333eec712dc2cf#msg_37 38

"3) While using the singleunit(centered) parameter is one way around the problem of a stratum with a single unit, in general we recommend to regroup the strata with a similar strata and not use the singleunit parameter.... The difference in the results between the two approaches however will be tiny."
Re: Svy command [message #4380 is a reply to message #4379] Sun, 17 May 2015 03:33
 erimgina@yahoo.com Messages: 3Registered: April 2015 Location: China Member
Dear All
Thank you for quick response, and it is very helpful

Erick
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