do you have to use a robust variance or covariance estimator to do a logistic regression why is the robust variance matrix in poisson what type of model is the robust covariance do you need a robust variance matrix in stata can a statistic be independent or dependent how to model the incidence of a disease with robust variance which variable are independent in an age range when you combine two data sets how to fit a robust variance why are single observations independent which variable can be independent of the robust variance of the statistic? which of the following is an example of robust covariance estimator? why is the splines in a poisson regression considered independent when to use robust variance in statistics when do you use the robust variance coefficient in the statistic why do you need robust variance which type of regression is an independent or dependent why is the robust variance inisson regression what is the robust variance of a population can you fit a robust covariance in a poisson regression can an attained age be included in a robust covariance equation