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st: Correctly setting FPC in svyset
From
R G <[email protected]>
To
[email protected]
Subject
st: Correctly setting FPC in svyset
Date
Wed, 9 Feb 2011 03:44:15 -0800 (PST)
Hello,
I'm analyzing a census I've done of schools, no stratification or clustering.
Response rate is around 50%. I need to set the FPC (finite population
correction) in svyset and I'm not sure the appropriate number to use. I know
some argue that there's no need to set the FPC, but in my case the issues I'm
surveying on there is a strong case for considering a finite population, and not
a superpopulation.
According to Stata help:
fpc(varname) requests a finite population correction for the variance
estimates. If varname has values less than or
equal to 1, it is interpreted as a stratum sampling rate f_h = n_h/N_h,
where n_h = number of units sampled from
stratum h and N_h = total number of units in the population belonging to
stratum h. If varname has values greater
than or equal to n_h, it is interpreted as containing N_h. It is an
error for varname to have values between 1
and n_h or to have a mixture of sampling rates and stratus sizes.
The UCLA page also states that:
Stata will calculate the actual fpc for us; we just need to specify the
population total.
(Source:
http://www.ats.ucla.edu/stat/stata/seminars/svy_stata_8/Stata_svy_seminar_sampling.htm)
If there are a total of 1000 schools, with 500 responses, am I correct in
interpreting that I should set the fpc=1000?
Just need to confirm this, as I'm relatively new at Stata's svy commands.
Thanks
Robin
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