This book is a slightly revised and expanded version of a set I I I of
notes used for a lecture series given at the Ecole dlEte de I
Probabilites at st. Flour in August 1986. In view of the statistical
nature of the material discussed herein it was agreed to publish the
material as a separate volume in the statistics series rather than, as
is the tradition, in a joint volume in the Lecture Notes in Mathematics
Series. It is a genuine pleasure to have this opportunity to thank I I I
the organizers of Les Ecoles dlEte, and in particular Professor P. -L.
Hennequin, for the excellent arrangements of these Summer Schools which
form a very significant forum for the exchange of scientific ideas
relating to probability. The efficient, careful and patient preparation
of the typescript by Oddbj rg Wethelund is also gratefully acknowledged.
Aarhus, June 1988 O. E. Barndorff-Nielsen Parametric statistical Models
and Likelihood O. E. Barndorff-Nielsen o. Introduction 0. 1. Outline of
contents 1 0. 2. A few preliminaries 2 1. Likelihood and auxiliary
statistics 1. 1. Likelihood 4 1. 2. Moments and cumulants of log
likelihood derivatives 10 1. 3. Parametrization invariance 13 1. 4.
Marginal and conditional likelihood 15 * 1. 5. Combinants, auxiliaries,
and the p -model 19 1. 6. Orthogonal parameters 27 1. 7. Pseudo
likelihood, profile likelihood and modified 30 profile likelihood 1. 8.
Ancillarity and conditionality 33 41 1. 9. Partial sufficiency and
partial ancillarity 1. 10.