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What are the logical values of the GLM function?
For glm : logical values indicating whether the response vector and model matrix used in the fitting process should be returned as components of the returned value. For glm.fit: x is a design matrix of dimension n * p, and y is a vector of observations of length n. logical; if FALSE a singular fit is an error. an optional list.
How is the standard error for a GLM calculated?
The standard error for the β j in a GLM that uses Fischer scoring or IWLS (iteratively weighted least squares) gets calculated as: in which ( X T W ^ X) − 1 is a by-product of the final IWLS iteration (the inverse of the estimated Fisher information). If ϕ is unknown, an estimate is required (as in quasi families).
Where does the dispersion parameter come from in GLM?
But I think you would like to know where dispersion parameter comes from: The dispersion parameter ϕ here is simply fixed at 1 (because it is a Negative Binomial GLM with known shape parameter that is used in the second stage). Thanks for contributing an answer to Cross Validated!
Which is the default fitting method in GLM?
The default method “glm.fit” uses iteratively reweighted least squares (IWLS): the alternative “model.frame” returns the model frame and does no fitting. User-supplied fitting functions can be supplied either as a function or a character string naming a function, with a function which takes the same arguments as glm.fit.
Which is the default control argument for GLm?
… For glm: arguments to be used to form the default control argument if it is not supplied directly. For weights: further arguments passed to or from other methods. glm returns an object of class inheriting from “glm” which inherits from the class “lm”.
When to use GLM for generalized linear models?
glm is used to fit generalized linear models, specified by giving a symbolic description of the linear predictor and a description of the error distribution.
Can a GLM string be a family function?
For glm this can be a character string naming a family function, a family function or the result of a call to a family function. For glm.fit only the third option is supported.