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Theory of Statistics - George Mason University

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2.3.2 The Le Cam Regularity Conditions<br />

2.4 The Exponential Class <strong>of</strong> Families 169<br />

The Le Cam regularity conditions are the first two <strong>of</strong> the usual FI regularity<br />

conditions plus the following.<br />

• The Fisher information matrix (see equation (1.80)) is positive definite for<br />

any fixed θ ∈ Θ.<br />

• There exists a positive number cθ and a positive function hθ such that<br />

E(hθ(X)) < ∞ and<br />

sup<br />

<br />

<br />

<br />

∂<br />

<br />

2 log fγ(x)<br />

∂γ(∂γ) T<br />

<br />

<br />

≤ hθ(x) a.e. (2.6)<br />

γ:γ−θ

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