what is nlme in statistics why do lme's work with x what's the complication in modeling what is the purpose of the lme r function for controlling for the variability in a variable x when determining effect of a variable, which factor should be a control for x how does factor a relates to y which variable is an example of a within subject factor why is it important to model a variable with two a levels? how to model for variability which factor is a correlated factor in logistic regression? what is the purpose of factor factor a which variable is correlated with the level and time period of factor a calculating the effect of a factor in an r model what model of variables is a variable that is correlated with a variable why are factor x correlated with the variability of each level when to account for the variability in a variable is factor y correlated with each level of a factor of A2 what is the difference between anova and factor a? which variable is correlated with y and is a dependent variable what is the difference between x and a