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help for ^ranvar^
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random group variance estimation of the mean for survey data
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	^ranvar^ varlist [aweight] [if]
	^ranvar2^ varlist [iweight] [if]

Description
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^ranvar^ calculates the random group variance estimator of the mean for survey
 data. The estimator is described in detail by Wolter (1985) "Introduction to 
Variance estimation", New York/Berlin (Springer). This estimator is an 
alternative to other estimators of the variance of sample statistics 
for survey data e.g. the jacknife or taylor linearization. The 
application of the random group estimator requires, that random groups 
are already defined during data collection.

Note: ^iweight^ is available with ^ranvar2^.

Note for ^SOEP^ Users: The estimation is described in K.4

Examples
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 . ^ranvar death net^
 . ^ranvar death net [aweight=bstrat] if sex==1 ^ 


Author
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	Frauke Kreuter
	University of Konstanz
	frauke.kreuter@@uni-konstanz.de
	

Also see
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    STB:
 Manual:
On-line: help for ^svymean^


