[R] Linear Model with curve fitting parameter?
smckinney at bccrc.ca
Fri Apr 1 03:34:07 CEST 2011
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of stephen sefick
> Sent: March-31-11 3:38 PM
> To: R help
> Subject: [R] Linear Model with curve fitting parameter?
> I have a model Q=K*A*(R^r)*(S^s)
> A, R, and S are data I have and K is a curve fitting parameter. I
> have linearized as
> I have taken the log of the data that I have and this is the model
> formula without the K part
> lm(Q~offset(A)+R+S, data=x)
> What is the formula that I should use?
Let Z = Q - A for your logged data.
Fitting lm(Z ~ R + S, data = x) should yield
intercept parameter estimate = estimate for log(K)
R coefficient parameter estimate = estimate for r
S coefficient parameter estimate = estimate for s
Molecular Oncology and Breast Cancer Program
British Columbia Cancer Research Centre
> Thanks for all of your help. I can provide a subset of data if necessary.
> Stephen Sefick
> | Auburn University |
> | Biological Sciences |
> | 331 Funchess Hall |
> | Auburn, Alabama |
> | 36849 |
> | sas0025 at auburn.edu |
> | http://www.auburn.edu/~sas0025 |
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