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MathGroup Archive 2005

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Re: Parameter Estimation for 3-parameter Weibull Distribution

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53660] Re: Parameter Estimation for 3-parameter Weibull Distribution
  • From: yanzj at dl.cn (Yan ZJ)
  • Date: Fri, 21 Jan 2005 06:37:36 -0500 (EST)
  • References: <6ghkla$lq3@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Dear Sir:

The program can not solve the accurate result at the step:


  pMLE = FindRoot[eqnLLF,{a,a/.pEst},{b,b/.pEst},{m,m/.pEst}] /. 
	x_Complex -> Re[x]

or at the step

  pEst = FindRoot[eqnEst, {a,minData}, {b, 1.}, {m, 1.}]

It shows me such information:
"Newton's method failed to converge to the prescribed accuracy after
(15) iterations."

How to overcome this problem??

Thank you to reply!!

Yan ZJ


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