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RE: st: svyselmlog - singleton cluster detected


From   Nick Cox <[email protected]>
To   "'[email protected]'" <[email protected]>
Subject   RE: st: svyselmlog - singleton cluster detected
Date   Thu, 31 Mar 2011 18:51:41 +0100

It seems, as one would guess, that -svyselmlog- gets its information on PSUs from what has been -svyset-. I can't add more. 

Nick 
[email protected] 

Murod Aliyev

Dear Nick,
Sorry for forgetting to specify the source. Yes, -svyselmlog- is from  SSC.
No, I do not use if or in. I use entire sample as checked  through svydes.
Many thanks!


Dear Joao,
Many thanks for the advice. I tried to do what you  suggested - to drop  
single observations in a PSU. -svyselmlog then  worked, but without  
bootsrapping. If boostrapping option is  specified then after two three  
resamplings it returns  "conformability error". Any advice on this error?
Many thanks!

----- Original Message ----
From: Joao Ricardo F. Lima <[email protected]>
To: [email protected]
Sent: Thu, 31 March, 2011 14:34:54
Subject: Re: st: svyselmlog - singleton cluster detected

Nick is right here.

You must have variables with missing values, the var_dep of the main equation.

You can do the -svydes var_dep, single- and see if there are stratum
with a singleton
PSU, correct (if exists) and run the -svyselmlog-.

Joao Lima

2011/3/31 Nick Cox <[email protected]>:
> -svyselmlog- is from SSC. Please remember to specify where
> user-written commands you refer to come from.
>
> Are you issuing any -if- or -in- restrictions? Are there missing
> values in any of those variables? Those are possible ways in which
> -svyselmlog- might see fewer observations than -svydes-.
>
> Nick
>
> On Thu, Mar 31, 2011 at 1:59 PM, Murod Aliyev <[email protected]> wrote:
>
>> I am using svyselmlog to estimate consumption levels for employees of 
>different
>> categories: wage, self-employed, entrepreneurs, unemployed. Data are from
>> stratified survey. However, svyselmlog returns an error message “singleton
>> cluster detected”. svydes command does not reveal any stratum with a 
singleton
>> PSU. Therefore, I am stuck as I do not understand the reason for the error
>> message to appear and I do not know how to solve the problem.

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