175
Semiparametric Models
Exact form of within group
distributions are unknown, but related to each other by some
finite dimensional parameter vector
•Full inference only
for comparing distributions
•One group’s distn can
be found from another group’s and a finite dimensional
parameter
•(Most often:
Distributions equal under H0)
(My definition
of semiparametric models is a little stronger than some statisticians’, but agrees with commonly used
semiparametric survival models)