Let us assume that an observation Xi is a random variable (r.v.) with
values in 1 1 (1R1, 8 ) and distribution Pi (1R1 is the real line, and 8
is the cr-algebra of its Borel subsets). Let us also assume that the
unknown distribution Pi belongs to a 1 certain parametric family {Pi(),
() E e}. We call the triple £i = {1R1, 8, Pi(), () E e} a statistical
experiment generated by the observation Xi. n We shall say that a
statistical experiment £n = {lRn, 8, P;, () E e} is the product of the
statistical experiments £i, i = 1, ..., n if PO' = P () X ... X P ()
(IRn 1 n n is the n-dimensional Euclidean space, and 8 is the cr-algebra
of its Borel subsets). In this manner the experiment £n is generated by
n independent observations X = (X1, ..., Xn). In this book we study the
statistical experiments £n generated by observations of the form j = 1,
..., n. (0.1) Xj = g(j, (}) + cj, c c In (0.1) g(j, (}) is a non-random
function defined on e, where e is the closure in IRq of the open set e
IRq, and C j are independent r. v .-s with common distribution function
(dJ.) P not depending on ().