for Bernoulli (p) distribution, the MLE estimator is sufficient for the parameter p; p=i

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Exercise 1
In lecture (Mon 1/30), we showed that
for Bernoulli (p) distribution, the MLE estimator
p=ī
is sufficient for the parameter p;
• for Uniform([a, b]), the MLE estimators
• N(μ,0²)
ô =! :=min(T ,xn), b = Yn := max(x₁,...,xn)
are jointly sufficient for the parameters a, b .
In this exercise, you will deduce similar results for the following four distributions:
Exp(X)
• Geometric (p)
Poisson(X)
(i) For each of these four distributions, write down their likelihood functions. (Hint: the
log-likelihood functions for these distributions were computed in previous lecture and
homework.)
(ii) Use the Fisher-Neyman factorization theorem to show that is a sufficient statistic
for each of the first three distributions.
(iii) Show that 1/2 is also a sufficient statistic for each of these three distributions.
(iv) Use the Fisher-Neyman factorization theorem to show that I, v are a pair of jointly
sufficient statistics for N(μ,0²).
(v) Show that I, s² are also a pair of jointly sufficient statistics for N(,0²). (Hint: relate
s² to v.)
Transcribed Image Text:Exercise 1 In lecture (Mon 1/30), we showed that for Bernoulli (p) distribution, the MLE estimator p=ī is sufficient for the parameter p; • for Uniform([a, b]), the MLE estimators • N(μ,0²) ô =! :=min(T ,xn), b = Yn := max(x₁,...,xn) are jointly sufficient for the parameters a, b . In this exercise, you will deduce similar results for the following four distributions: Exp(X) • Geometric (p) Poisson(X) (i) For each of these four distributions, write down their likelihood functions. (Hint: the log-likelihood functions for these distributions were computed in previous lecture and homework.) (ii) Use the Fisher-Neyman factorization theorem to show that is a sufficient statistic for each of the first three distributions. (iii) Show that 1/2 is also a sufficient statistic for each of these three distributions. (iv) Use the Fisher-Neyman factorization theorem to show that I, v are a pair of jointly sufficient statistics for N(μ,0²). (v) Show that I, s² are also a pair of jointly sufficient statistics for N(,0²). (Hint: relate s² to v.)
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