given a data.frame of means and variances, use a two step non-linear least squares. The first step is done on the mean vs sd, then the estimates are used in a second that estimates them using the mean vs rsd.
given a data.frame of means and variances, use a two step non-linear least squares. The first step is done on the mean vs sd, then the estimates are used in a second that estimates them using the mean vs rsd.