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

 From Michael Begg <[email protected]> To [email protected] Subject Re: st: missing standard error because of stratum with single sampling unit Date Fri, 8 Jan 2010 10:24:24 +1100

```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/
```

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