Hi Joao,
I am running Stata/IC 11 for Mac and yes, it is updated.
Cheers
Michael
On 08/01/2010, at 10:17 AM, Joao Ricardo F. Lima wrote:
> Michael,
>
> what's the version of your Stata? Is it updated?
>
> Joao Lima
>
> 2010/1/7 Michael Begg <[email protected]>:
>> 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.
>>
>>
>> As per http://www.stata.com/support/faqs/stat/stratum.html, I check my data using svydes hhsize and find the following:
>>
>> Survey: Describing stage 1 sampling units
>>
>> pweight: weight
>> VCE: linearized
>> Single unit: missing
>> Strata 1: rural
>> SU 1: psu
>> FPC 1: npsu
>> Strata 2: <one>
>> SU 2: ssu
>> FPC 2: nssu
>> Strata 3: <one>
>> SU 3: hh
>> FPC 3: nhh
>>
>> #Obs with #Obs with #Obs per included Unit
>> #Units #Units complete missing ----------------------------
>> Stratum included omitted data data min mean max
>> -------- -------- -------- -------- -------- -------- -------- --------
>> 1 136 0 4241 0 16 31.2 39
>> 2 58 0 1723 0 16 29.7 32
>> -------- -------- -------- -------- -------- -------- -------- --------
>> 2 194 0 5964 0 16 30.7 39
>> ------------------
>> 5964
>>
>> Why are the standard errors missing when both stratum have more than one sampling unit and there are no missing observations.
>>
>> Thanks for your help
>>
>> Cheers
>>
>> Michael
>>
>>
>> *
>> * For searches and help try:
>> * http://www.stata.com/help.cgi?search
>> * http://www.stata.com/support/statalist/faq
>> * http://www.ats.ucla.edu/stat/stata/
>>
>
>
>
> --
> ----------------------------------------
> Joao Ricardo Lima, D.Sc.
> Professor
> UFPB-CCA-DCFS
> Fone: +5538387264913
> Skype: joao_ricardo_lima
> ----------------------------------------
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
