what is the correct covariance structure in r? what is nlme r why use r to fit a condition in r what is the most appropriate model with dv what is the ____ of this covariance structure? what is the covariance structure in a multilevel model of the physiological response what type of model do you use to fit a condition which covariance structure is correct to use in multilevel data sets? which covariance structure would be correct to use in a multilevel model? what is the r covariance structure which of the following is a covariance structure what is the correct covariance structure for r what is the r function for time and correlation can covariance be adjusted to a fixed criterion in r what does lme mean in r which type of covariance would be appropriate and correct what is multilevel covariance what is a covariance pattern for r which covariance structure best fits a multilevel model which r command is appropriate for the covariance of a data set?