From a linear model like `mod <- lm(y ~ x)`, I can obtain a data frame with all the variables involved in the model (in that case, `y` and `x`). How could I get a similar data frame from an lme object, e.g. fitted as `mod <- lme(y ~ x, random=~1|g)` ? I know that `getData` might work if the variables come from a data frame, but the result is `NULL` if it is not like that. And if there is a transformation (e.g. `lme(log(y)~x, ...)`), the result of `getData` gives the original, untransformed variable. Kind regards Helios De Rosario