estfunReg: Extract Empirical First Derivative of Log-likelihood Function
Description
Generic function for extracting the empirical first derivative of log-likelihood function of a fitted regularized model.
Usage
estfunReg(x, ...)
Value
A matrix containing the empirical first derivative of log-likelihood functions.
Typically, this should be an \(n \times k\) matrix corresponding
to \(n\) observations and \(k\) parameters. The columns should be named
as in coef or terms, respectively.
Arguments
x
a fitted model object.
...
arguments passed to methods.
Author
Zhu Wang <zwang145@uthsc.edu>
References
Zhu Wang, Shuangge Ma and Ching-Yun Wang (2015) Variable selection for zero-inflated and overdispersed data with application to health care demand in Germany, Biometrical Journal. 57(5):867-84.