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Re: st: missing standard error because of stratum with single sampling unit


From   Michael Begg <mbstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: missing standard error because of stratum with single sampling unit
Date   Wed, 13 Jan 2010 08:51:41 +1100

Hi Steve, 

I have heard back from Stata Technical and it is not a bug. 

I made a mistake below, my survey is actually a 3 stage design and the singletons were in the second stage. My apologies for this. 

So I guess I now have three options 

1) Drop the observations that are causing the problem - in this case 426 out of a sample of 5,964. 
2) Add one of the three singleunit() option to my -svyset- command. 
3) Reassign the sampling unit to another appropriately chosen stratum or in my case, reassign the ssu to a different psu. 

For 2), does anyone have any recommendations on which option to choose? 
For 3) how would I go about reallocating the 18 ssu to a new psu? 

Cheers

Michael


On 08/01/2010, at 8:22 AM, sjsamuels@gmail.com wrote:

> It looks like a  bug, and I suggest that you send it to Technical
> Support. Be sure to show them (and us) what you see if you run:
> 
> svydes hhsize, single gen(bad_strat)
> 
> -Steve
> 
> On Thu, Jan 7, 2010 at 2:33 AM, Michael Begg <mbstata@gmail.com> wrote:
>> Hi,
>> 
>> I am working on a data from a 2 stage survey design with 2 stratum. When I calculate the mean of hhsize, the standard error is missing as shown below.
>> 
>> 
>> svy: mean hhsize
>> (running mean on estimation sample)
>> 
>> Survey: Mean estimation
>> 
>> Number of strata =       2        Number of obs    =      5964
>> Number of PSUs   =     194        Population size  =  16041309
>>                                  Design df        =       192
>> 
>> --------------------------------------------------------------
>>             |             Linearized
>>             |       Mean   Std. Err.     [95% Conf. Interval]
>> -------------+------------------------------------------------
>>      hhsize |   4.656919          .             .           .
>> --------------------------------------------------------------
>> Note: missing standard error because of stratum with single
>>      sampling unit.
>> 
>> 
> 
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