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Mar 23, 2021 at 14:52 vote accept statwoman
Mar 23, 2021 at 9:01 history edited Ben CC BY-SA 4.0
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Mar 23, 2021 at 9:01 comment added Ben Indeed. But the condition you have specified in your question is $a>1$. I think you can just compute the derivatives from scratch in this case.
Mar 23, 2021 at 6:57 comment added Yves It is quite well-known that if $g(\boldsymbol{\theta})$ is a non-negative convex function of $\boldsymbol{\theta}$ then $g(\boldsymbol{\theta})^a$ is convex for $a \geq 1$. Yet, this does not give a strict convexity, and does not provides us with derivatives fot the optimisation.
Mar 23, 2021 at 5:06 comment added Ben @statwoman: Sorry about that --- I misread the initial density function. I have edited the answer to correct the analysis.
Mar 23, 2021 at 5:05 history edited Ben CC BY-SA 4.0
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Mar 23, 2021 at 1:55 history edited Ben CC BY-SA 4.0
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Mar 23, 2021 at 1:51 comment added statwoman You wouldn't have the log in the first equation, since it is $exp(−|x−\theta|^a)$.
Mar 22, 2021 at 22:54 history edited Ben CC BY-SA 4.0
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Mar 22, 2021 at 20:23 vote accept statwoman
Mar 23, 2021 at 3:11
Mar 22, 2021 at 9:00 history answered Ben CC BY-SA 4.0