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Wednesday, 14 May 2014

Continuity theorem

The lecture schedules mention "Moment generating functions and statement (no proof) of continuity theorem.''

The continuity theorem (which I forgot to name) is in fact described in Remark 1 on page 91 of the notes. It is the result that if a sequence of random variables X1,X2, have moment generating functions mi(θ), i=1,2,, and mi(θ)m(θ) as i, pointwise for every θ, then Xi tends in distribution to the random variable having m.g.f. m(θ).

We use this when we give a "sketch of proof" of the Central limit theorem on page 91.

Lévy's continuity theorem is the same thing, but for characteristic functions.