what is a mean in a curve what model is used in r what is the difference between a sgarch model and a regressor model garch-m model variance what is garch mean why is t a variable in r r how to calculate the variance what is sgarch variance in eviews how to approximate a gach model in r sgach model variance what is garch m what is model t in a r table called if a r variable is t, what is the r mean in a sgarch model what is the difference between eviews and r? what is the difference between a sgarch model and arugarch model difference between the eviews and r curve why does eviews and r have different data sets what is the variance in garch how do you find the variance of a garck-m model what r model is used to estimate mean and variance