update.survey.design {survey} | R Documentation |
Update the data variables in a survey design, either with a formula for a new set of variables or with an expression for variables to be added.
## S3 method for class 'survey.design': update(object, ...) ## S3 method for class 'svyrep.design': update(object, ...)
object |
a survey.design object |
... |
Arguments tag=expr add a new variable tag
computed by evaluating expr in the survey data. |
A survey.design
or svyrep.design
object
data(api) dstrat<-svydesign(id=~1,strata=~stype, weights=~pw, data=apistrat, fpc=~fpc) dstrat<-update(dstrat, apidiff=api00-api99) svymean(~api99+api00+apidiff, dstrat)