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Re: st: deleting observations


From   menale kassie <dawitkassie@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: deleting observations
Date   Tue, 12 Sep 2006 09:07:28 -0700 (PDT)

Dear statlisters,

Once more I would like to get your help on deleting
observations. When I run equation 1 below after the
command (bys hhn: drop if _N==1) the minimum number of
observation per group (household (hhn) is two.

However, When I run equation 2 below for the
sub-sample of observations using indicator variable
(sterrace ==1) after the command (bys hhn: drop if
_N==1) the minimum number of observation per group is
one. I was expecting the minimum observation per group
to be more than one. I am not clear why this is
happening. I appreciate any help on this.

1) xtreg lnprovalue sex lnfamysize lnage tlu  educ
lnareahh,  i(hhn) fe
Number of obs      =      1279
Number of groups   =       355
Obs per group: min =         2
                avg =       3.6
                max =        11

2) xtreg lnprovalue sex lnfamysize lnage tlu educ
lnareahh if sterrace ==1, i(hhn) fe

Number of obs      =       225
Number of groups   =       150
Obs per group: min =         1
                avg =       1.5
                max =         4

Regards
Menale



--- Maarten buis <maartenbuis@yahoo.co.uk> wrote:

> bys HHLDid: drop if _N==1
>
> --- menale kassie <dawitkassie@yahoo.com> wrote:
>> I would
>> like to delete those households who have one plot
> from
>> the list of observations. Below is the data
>> structure.
>>
>> HHLDid  Plot
>> 1	1
>> 1	2
>> 1       3
>> 2       1
>> 2       2
>> 3       1
>> etc
>
>
>
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting adress:
> Buitenveldertselaan 3 (Metropolitan), room Z434
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
>
>
>
>
>
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