what type of matrix does r use to find a coefficient sas covariance matrix definition what is the covariance matrix g how to make matrix in r in nlme what model is j2j2 what is the _______ of the gaussian model? which matrix does sas fit in gaussian model? which ga in r would be the best fit what type of matrix does nlme use which covariance matrix to fit the gaussian model which r model is best fit to the following gaussian model? what is the matrix of a gaussian model in r how to use r to fit a specific model r. how to insert a covariance matrix why is it difficult to fit a gaussian model in r how to fit a gaussian model what type of matrix is used to fit a particular gaussian model in r? what is the correct formula for a gaussian model? what is the exchangeable matrix of sas which r model requires a general exchangeable matrix?