Displaying 2 results from an estimated 2 matches for "degdays".
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regdays
2008 Sep 05
2
using nls to fit a curve to data
Hi,
I am trying to fit a curve to data. My command line is:
model10=nls(offspring~((A*c^k)/gamma(k))*((degdays-alpha)^(k-1))*exp(-c*(degdays-alpha)),
start=list(A=30,k=2,c=.018,alpha=131))
I get the error message:
Error in numericDeriv(form[[3]], names(ind), env) :
Missing value or an infinity produced when evaluating the model
In addition: Warning message:
full precision was not achieved in '...
2008 Jul 02
0
question on dispersion parameter
Hi,
I'm programming in R and below is a summary of a generalized linear model:
************************************************** ***
Call:
glm(formula = offspring ~ degdays, family = quasi(link = "log", variance =
"mu"), data = fecundity)
Deviance Residuals:
Min 1Q Median 3Q Max
-0.76674 -0.29117 -0.09664 0.15668 1.00800
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) -1.131351 0.030480 -37.12 <2e-16 ***
degdays -0.008803 0.0...