how to know if variance is constant in garch model how to know if model variance is constant jarque what is the coefficient of error t value how to read garch models what is the model variance how to find if your variance is constant in garch how to understand if the variance is constant how to find out if a model variance is constant? what is the variance of garch why is the variance constant in garch how do i know the variance is constant in garch model what is garch model what is the variance of the garch model what is the coefficient of a garch model what is the variance in garch when a model is constant which value is used to measure its variance how to know if the variance is constant what is the variance of a garch model is variance constant if variance is constant what does the tseries package do