survey (version 2.4)

svyby: Survey statistics on subsets

Description

Compute survey statistics on subsets of a survey defined by factors.

Usage

svyby(formula, by, design, FUN, ..., keep.var = FALSE, keep.names = TRUE)

Arguments

formula

A formula specifying the variables to pass to FUN

by

A formula specifying factors that define subsets, or a list of factors.

design

A svydesign object

FUN

A function taking a formula and survey design object as its first two arguments.

...

Other arguments to FUN

keep.var

If FUN returns a svystat object, extract standard errors from it

keep.names

Define row names based on the subsets

Value

• A data frame showing the factors and the results of FUN

See Also

svytable

Examples

data(api)
dclus1<-svydesign(id=~dnum, weights=~pw, data=apiclus1, fpc=~fpc)

svyby(~api99, ~stype, dclus1, svymean)
svyby(~api99, ~stype, dclus1, svyquantile, quantiles=0.5)
svyby(~api99, list(school.type=apiclus1$stype), dclus1, svymean)
svyby(~api99+api00, ~stype+sch.wide, dclus1, svymean, keep.var=TRUE)