as.svydesign converts an
object to the new structure and .svycheck warns if an object
does not have the new structure.You can set options(survey.want.obsolete=TRUE) to suppress the
warnings produced by .svycheck and
options(survey.ultimate.cluster=TRUE) to always compute
variances based on just the first stage of sampling.
as.svydesign2(object)
.svycheck(object)svydesignsurvey.design2svydesign, svyrecvar