Maximum likelihood and Mathematica
- To: mathgroup at smc.vnet.net
- Subject: [mg85252] Maximum likelihood and Mathematica
- From: snowrain <anne_xuetulip at hotmail.com>
- Date: Mon, 4 Feb 2008 03:13:53 -0500 (EST)
- Organization: The Math Forum
I am doing MLE with Mathematica. When I put the parameters estimated from concentrated loglikelihood function into the gradient, the value is not close to zero. The command I used was "NMaximize". Does it only look for local maximum ?
When I estimate unconcentrated loglikelihood function, it shows error information that the loglikelihood is a complex number. There must be something wrong with the command that I am using since the concentrated and unconcentrated loglikehood functions should lead to the same estimate.
I found there is a package "Global Optimization" by Mathematica. Do I have to purchase and use it to find global optimization? And, why do I have different answers from the two loglikelihood functions? How can I check the steps/process of how Mathematica estimates the parameters? Thanks a lot !
Prev by Date:
Re: Accessing the contents of the clipboard
Next by Date:
Re: Possible bug in ListAnimate or Manipulate v6.0
Previous by thread:
Re: Fourier Series Expansions and it's Coefficients question revised
Next by thread:
Re: Maximum likelihood and Mathematica