The function verifies not only the
class attribute, but the
structure of the object.
the object to be verified.
Rate tables are used by the
survexp functions, and normally
contain death rates for some population, categorized by age, sex, or other
variables. They have a fairly rigid structure, and the
can help in creating a new rate table.
x is a ratetable, and
FALSE or a description if it is not.
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