5 The parameter estimate (depends on the random observables and is itself a random variable. The parameter a may be random vector or a nonrandom parameter vector. Specific cases of parameter estimation occur depending on whether pdf is known or unknown. UESTC 44 UESTC • The parameter estimate depends on the random observables and is itself a random variable. • The parameter may be random vector or a nonrandom parameter vector. • Specific cases of parameter estimation occur depending on whether pdf is known or unknown. α ˆ( y) α