strata | R Documentation |
This is a special function used only in identifying the strata variables
when defining an exactMatch
during a call to fullmatch
,
pairmatch
, or match_on
. It should not be called externally.
strata(...)
... |
any number of variables of the same length. |
the variables with appropriate labels
data(nuclearplants)
fullmatch(pr ~ cost + strata(pt), data = nuclearplants)
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