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Re: Logistic model in COMFIT function [message #93814 is a reply to message #93810]

Wed, 26 October 2016 07:28

dcleuclidwl
Messages: 6
Registered: July 2016

Junior Member

Perhaps your confusion comes from not taking into account that exponents take precedence over multiplication?

So y=1/(a0a1^x+a2) is the same as y = 1/(a0*(a1^x) + a2)

On Tuesday, October 25, 2016 at 4:37:22 PM UTC-4, bedro...@gmail.com wrote:
> Hi,
>
> I am currently using the logistic model in COMFIT. The results are good; however, when I read the equation IDL uses for logistic model, I got confused. The equation is: y=1/(a0a1^x+a2). I can not understand why a0 and a1 are necessary? They can be combined as one empirical parameter. How does each of the empirical parameter work in this IDL function?
>
> If you can provide any thought, I will greatly appreciate.
>
> Thank you.
>
> Sincerely,
> Nick

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[Message index]

		Logistic model in COMFIT function By: bedroom330 on Tue, 25 October 2016 13:37
		Re: Logistic model in COMFIT function By: Dick Jackson on Wed, 26 October 2016 07:24
		Re: Logistic model in COMFIT function By: dcleuclidwl on Wed, 26 October 2016 07:28

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