#' Example Survey dataset
#'
#' A sample dataset derived from Household Survey used for demonstrating
#' survey estimation functions.
#'
#' @format A data frame with several variables:
#' \describe{
#'   \item{CR509}{School participation indicator}
#'   \item{R101}{Province (factor)}
#'   \item{JMLH_PDDK}{Population count}
#'   \item{CRCOB}{Eligibility indicator}
#'   \item{IDSUBSLS}{Primary Sampling Unit (PSU) identifier. This variable represents the first-stage sampling unit (e.g., census block or sub-subsample area)
#'   selected during the first stage of sampling. Each PSU is uniquely identified within a stratum.}
#'   \item{IDRUTA}{Secondary Sampling Unit (SSU) identifier. This variable represents the second-stage sampling unit (household level).
#'   Households are selected within each PSU during the second stage of sampling.}
#'   \item{IDIDV}{Tertiary Sampling Unit (TSU) identifier. This variable represents the third-stage sampling unit (individual level).
#'   Individuals are selected within households during the third stage of sampling.}
#'   \item{STRATA}{Stratification variable. Defines the survey strata, typically based on geographic or administrative regions.
#'   Stratification improves the precision of estimates and ensures representation across regions.}
#'   \item{W_FINAL}{Final sampling weight. This weight reflects the inverse probability of selection, adjusted for non-response
#'   and calibrated to known population totals. It must be applied to produce unbiased estimates.}
#'   \item{FPC1}{Finite Population Correction (FPC) for the first stage. Represents the total number of PSUs in each stratum. Used to adjust variance estimation
#'   under sampling without replacement at the first stage.}
#'   \item{FPC2}{Finite Population Correction (FPC) for the second stage. Represents the total number of households within each PSU. Used for variance correction
#'   at the second sampling stage.}
#'   \item{FPC3}{Finite Population Correction (FPC) for the third stage. Represents the total number of individuals within each household. Used for variance correction
#'   at the third sampling stage.}
#' }
#'
#' The survey design follows a three-stage stratified cluster sampling scheme:
#' \enumerate{
#'   \item First stage: selection of PSUs (\code{IDSUBSLS}) within strata (\code{STRATA})
#'   \item Second stage: selection of households (\code{IDRUTA}) within PSUs
#'   \item Third stage: selection of individuals (\code{IDIDV}) within households
#' }
#'
#' The inclusion of FPC variables ensures correct variance estimation under
#' without-replacement sampling assumptions.
#'
#' @source Simulated Household Survey Data
"datause"
