search for: logtheta

...summary() gives an estimate of log(theta) and its standard error, z-value and Pr(>|z|) for the count component. Additionally, it also provided an estimate of Theta, which I believe is the exp(estimate of log(theta)). However, if I would like to have an standard error of Theta itself (not the SE.logtheta), how would I obtain or calculate that standard error? Thank you very much for your time. Best regards, Tzeng Yih Lam ------------------------------------------------------------------------------ PhD Candidate Department of Forest Engineering, Resources and Management College of Forestry Oregon...

Dear all, I would like to ask, if there is a way to make the variance / dispersion parameter $\theta$ (referring to MASS, 4th edition, p. 206) in the function glm.nb dependent on the data, e.g. $1/ \theta = exp(x \beta)$ and to estimate the parameter vector $\beta$ additionally. If this is not possible with glm.nb, is there another function / package which might do that? Thank you very much for