題組內容

2. (50 %) About hypothesis test:
(a) Suppose the parameter space of a family of pdf or pmfs $\{f(x|\theta)|\theta \in \Theta\}$ has been partitioned into two subspaces $\Theta_0, \Theta_0^c$, such that $\Theta = \Theta_0 \cup \Theta_0^c$. Consider the hypotheses of $H_0: \theta \in \Theta_0$ v.s. $H_1: \theta \in \Theta_0^c$. Describe the following definitions with proper notations:

iv. Likelihood ratio test (LRT).