Message-ID: <CACk-te37N6ZHty4+dnLRYOXY=VxTC_Ps8iRi6NqhkOeQnPQMdw@mail.gmail.com>
Date: 2013-01-31T20:26:19Z
From: Bert Gunter
Subject: LogLik of nls
In-Reply-To: <CAF7StsYtuHtvn_TXQAa6svi-4qP7LgtHnEOY08SF4hrJiNCzuA@mail.gmail.com>
methods(logLik) ## for S3 methods
stats:::logLik.nls
### and look at the code!
-- Bert
On Thu, Jan 31, 2013 at 12:06 PM, Diviya Smith <diviya.smith at gmail.com> wrote:
> Hello there,
>
> Can anyone point me to the code for logLik of an nls object? I found the
> code for logLik of an lm but could not find exactly what function is used
> for calculating the logLik of nls function?
>
> I am using the nls to fit the following model to data -
> Model 1: y ~ Ae^(-mx) + Be^(-nx) +c
>
> and want to understand what is the likelihood function used by nls.
> Presumably it is using -
> N(Ae^(-mx) + Be^(-nx) +c, var = residuals from nls)
>
> Thank you in advance,
>
> Diviya
>
> [[alternative HTML version deleted]]
>
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--
Bert Gunter
Genentech Nonclinical Biostatistics
Internal Contact Info:
Phone: 467-7374
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