Given a formula of the form
~ psu_v1 + psu_v2 + ... + strata(strata_v1 + strata_v2 + ...)
"psu.formula"a formula describing the primary sampling unit vars
"strata.formula"a formula describing the strata (if any)
check to be sure no response is included (or warn)
check formulas for strata more carefully...
a formula describing the sample design (see above)
a list with entries
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