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Extract or replace the stratum names of a capthist object.
capthist
strata(object, ...) strata(object) <- value
a character vector with one value for each session in capthist.
object with `stratum' attribute e.g. capthist
character vector or vector that may be coerced to character, one value per stratum
other arguments (not used)
Replacement values will be coerced to character.
openCR.fit, session, stratify
openCR.fit
session
stratify
# artificial example, treating years as strata strata(ovenCH)
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