Computes derivatives of inverse of link functions (real estimates) with respect to the beta parameters which are used for delta method computation of the var-cov matrix of real parameters.
deriv_inverse.link(real, x, link)Vector of derivative values computed at values of real parameters
Vector of values of real parameters
Matrix of design values
Type of link function (e.g., "logit")
Jeff Laake
Note: that function was renamed to deriv_inverse.link to avoid S3 generic class conflicts. The derivatives of the inverse of the link functions are simple computations using the real values and the design matrix values. The body of the function is as follows:
switch(link, logit=x*real*(1-real), log=x*real,
loglog=-real*x*log(real), cloglog=-log(1-real)*x*(1-real), identity=x,
mlogit=x*real*(1-real)) inverse.link, compute.real