Nothing

```
#' Simulated dataset
#'
#' Sample of 500 subjects simulated according to a linear mixed model.
#' The fixed part of the model included an intercept, 2 natural cubic splines on time
#' and their interactions with time-independent covariates X1, X2 and X3.
#' A random intercept and a independant error term were also inclued.
#'
#' @name dataEx
#' @docType data
#' @format A data frame with 2429 observations on the following 6 variables.
#' \describe{ \item{i}{subject identification number}
#' \item{t}{time of measurement} \item{X1}{binary covariate}
#' \item{X2}{continous Gaussian standard variable}
#' \item{X3}{continous Gaussian variable}
#' \item{Y}{longitudinal outcome}}
#' @keywords datasets
NULL
```

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