sandwich: Sandwich Variance and Covariance Matrix for PLreg Objects
Description
The sandwich function provides an estimate for the asymptotic variance
and covariance matrix of the parameter estimators of the power logit (or log-log)
regression models based on de sandwich estimator (see Queiroz and Ferrari (2022)).
Usage
sandwich(object)
Value
extra.parameter returns a matrix containing the sandwich variance and
covariance matrix estimate.
Arguments
object
fitted model object of class "PLreg".
References
Queiroz, F. F. and Ferrari, S. L. P. (2022). Power logit regression
for modeling bounded data. arXiv:2202.01697.