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Parse a formula of the form ~ psu_v1 + psu_v2 + ... + strata(strata_v1 + strata_v2 + ...) into a PSU formula and a strata formula.
~ psu_v1 + psu_v2 + ... + strata(strata_v1 + strata_v2 + ...)
parse_design(formula)
a list with entries psu.formula and strata.formula
psu.formula
strata.formula
a formula describing the sample design (see Description of bootstrap.estimates())
bootstrap.estimates()