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how to give the initial estimate for function comfit [message #50136]

Fri, 08 September 2006 19:10

chen123.dian
Messages: 4
Registered: April 2006

Junior Member

Hi,

I am using functon comfit to fit y=a0*(x^a1)+a2. The command I used,
result=comfit(x, y, a, /geometric).
The problem is how to give the initial estimate 'a'. I tried several
different values, the results were different. So which results should
be used? How to choose the initial values?

Thanks so much!

Chen

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