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extdata
2003 Sep 09
1
tree mortality risk model using glm()
...ed every second year whether they stand up (0) or have
fallen (1).
I assume that the tree fall probability is predicted by
TF = 1 - exp(-(dbh + soil))
log(1 - TF) = -(dbh + soil)
I thought the following call would fit the model, but I get an error message.
test<- glm(1-TF ~ dbh +soil , data = extdat, family = quasibinomial(link =
"log"))
Error: no valid set of coefficients has been found:please supply starting
values
In addition: Warning message:
NaNs produced in: log(x)
Could someone give a clue on what is wrong. Is there another way to fit
this model?
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