# surveysummary

0th

Percentile

##### Summary statistics for sample surveys

Compute means, variances, ratios and totals for data from complex surveys.

Keywords
univar, survey
##### Usage
## S3 method for class 'survey.design':
svymean(x, design, na.rm=FALSE,deff=FALSE,...)
## S3 method for class 'twophase':
svymean(x, design, na.rm=FALSE,deff=FALSE,...)
## S3 method for class 'svyrep.design':
svymean(x, design, na.rm=FALSE, rho=NULL,
return.replicates=FALSE, deff=FALSE,...)
## S3 method for class 'survey.design':
svyvar(x, design, na.rm=FALSE,...)
## S3 method for class 'svyrep.design':
svyvar(x, design, na.rm=FALSE, rho=NULL,
return.replicates=FALSE,...,estimate.only=FALSE)
## S3 method for class 'survey.design':
svytotal(x, design, na.rm=FALSE,deff=FALSE,...)
## S3 method for class 'twophase':
svytotal(x, design, na.rm=FALSE,deff=FALSE,...)
## S3 method for class 'svyrep.design':
svytotal(x, design, na.rm=FALSE, rho=NULL,
return.replicates=FALSE, deff=FALSE,...)
## S3 method for class 'svystat':
coef(object,...)
## S3 method for class 'svrepstat':
coef(object,...)
## S3 method for class 'svystat':
vcov(object,...)
## S3 method for class 'svrepstat':
vcov(object,...)
cv(object,...)
deff(object, quietly=FALSE,...)
make.formula(names)
##### Arguments
x
A formula, vector or matrix
design
survey.design or svyrep.design object
na.rm
Should cases with missing values be dropped?
rho
parameter for Fay's variance estimator in a BRR design
return.replicates
Return the replicate means?
deff
Return the design effect (see below)
object
The result of one of the other survey summary functions
quietly
Don't warn when there is no design effect computed
estimate.only
Don't compute standard errors (useful when svyvar is used to estimate the design effect)
...
additional arguments to cv methods,not currently used
names
vector of character strings
##### Details

These functions perform weighted estimation, with each observation being weighted by the inverse of its sampling probability. Except for the table functions, these also give precision estimates that incorporate the effects of stratification and clustering.

Factor variables are converted to sets of indicator variables for each category in computing means and totals. Combining this with the interaction function, allows crosstabulations. See ftable.svystat for formatting the output.

With na.rm=TRUE, all cases with missing data are removed. With na.rm=FALSE cases with missing data are not removed and so will produce missing results. When using replicate weights and na.rm=FALSE it may be useful to set options(na.action="na.pass"), otherwise all replicates with any missing results will be discarded.

The svytotal and svreptotal functions estimate a population total. Use predict on svyratio and svyglm, to get ratio or regression estimates of totals.

The design effect compares the variance of a mean or total to the variance from a study of the same size using simple random sampling without replacement. Note that the design effect will be incorrect if the weights have been rescaled so that they are not reciprocals of sampling probabilities. To obtain an estimate of the design effect comparing to simple random sampling with replacement, which does not have this requirement, use deff="replace". This with-replacement design effect is the square of Kish's "deft".

The cv function computes the coefficient of variation of a statistic such as ratio, mean or total. The default method is for any object with methods for SE and coef.

make.formula makes a formula from a vector of names. This is useful because formulas as the best way to specify variables to the survey functions.

##### Value

• Objects of class "svystat" or "svrepstat", which are vectors with a "var" attribute giving the variance and a "statistic" attribute giving the name of the statistic.

svydesign, as.svrepdesign, svrepdesign, svyquantile , ftable.svystat

##### Aliases
• svymean
• svymean.survey.design
• svymean.survey.design2
• svymean.svyrep.design
• svymean.twophase
• svytotal
• svytotal.twophase
• svytotal.survey.design
• svytotal.survey.design2
• svytotal.svyrep.design
• svyvar
• svyvar.survey.design
• svyvar.svyrep.design
• coef.svystat
• vcov.svystat
• coef.svrepstat
• vcov.svrepstat
• cv.svyratio
• cv.svrepratio
• cv.svrepstat
• cv.svystat
• cv.default
• cv
• deff
• deff.default
• make.formula
##### Examples
data(api)

## one-stage cluster sample
dclus1<-svydesign(id=~dnum, weights=~pw, data=apiclus1, fpc=~fpc)
summary(dclus1)
svymean(~api00, dclus1, deff=TRUE)
svymean(~factor(stype),dclus1)
svymean(~interaction(stype, comp.imp), dclus1)
svyquantile(~api00, dclus1, c(.25,.5,.75))
svyvar(~api00, dclus1)
svytotal(~enroll, dclus1, deff=TRUE)
svyratio(~api.stu, ~enroll, dclus1)

#stratified sample
dstrat<-svydesign(id=~1, strata=~stype, weights=~pw, data=apistrat, fpc=~fpc)
summary(dstrat)
svymean(~api00, dstrat)
svyquantile(~api00, dstrat, c(.25,.5,.75))
svyvar(~api00, dstrat)
svytotal(~enroll, dstrat)
svyratio(~api.stu, ~enroll, dstrat)

# replicate weights - jackknife (this is slow)
jkstrat<-as.svrepdesign(dstrat)
summary(jkstrat)
svymean(~api00, jkstrat)
svymean(~factor(stype),jkstrat)
svyvar(~api00,jkstrat)
svyquantile(~api00, jkstrat, c(.25,.5,.75))
svytotal(~enroll, jkstrat)
svyratio(~api.stu, ~enroll, jkstrat)

# coefficients of variation
cv(svytotal(~enroll,dstrat))
cv(svyratio(~api.stu, ~enroll, jkstrat))

# extracting statistic and variance
coef(svytotal(~enroll,dstrat))
vcov(svymean(~api00+api99,jkstrat))

# Design effect
svymean(~api00, dstrat, deff=TRUE)
svymean(~api00, dstrat, deff="replace")
svymean(~api00, jkstrat, deff=TRUE)
svymean(~api00, jkstrat, deff="replace")
(a<-svytotal(~enroll, dclus1, deff=TRUE))
deff(a)
Documentation reproduced from package survey, version 3.9-1, License: GPL-2 | GPL-3

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