MLMusingR: Practical Multilevel Modeling

#' Thai data from PISA (reduced)
#'
#' Example data to be used for centering
#' @usage data(thai)
#' @format A data frame with 4271 rows and 7 variables:
#' \describe{
#'   \item{math}{First plausible value in mathematics.}
#'   \item{escs}{Index of economic, social, and cultural status.}
#'   \item{intmat}{Mathematics interest.}
#'   \item{schoolid}{School identifier}
#'   \item{othl}{Spoke another language at home other than Thai. 1 = yes, 0 = no.}
#'   \item{private}{Private school. 1 = yes, 0 = no.}
#'   \item{schsize}{Total school enrolment.}
#' }
#' @source \url{https://gpseducation.oecd.org/CountryProfile?primaryCountry=THA}
"thai.sm"