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#' retroharmonize: Retrospective harmonization of survey data files
#'
#' The goal of \code{retroharmonize} is to facilitate retrospective (ex-post)
#' harmonization of data, particularly survey data, in a reproducible manner.
#' The package provides tools for organizing the metadata, standardizing the
#' coding of variables, variable names and value labels, including missing
#' values, and for documenting all transformations, with the help of
#' comprehensive S3 classes.
#'
#' @section import functions:
#' Read data stored in formats with rich metadata, such as SPSS (.sav) files,
#' and make them usable in a programmatic context.\cr
#' \code{\link{read_spss}}: read an SPSS file and record metadata for reproducibility\cr
#' \code{\link{read_rds}}: read an rds file and record metadata for reproducibility\cr
#' \code{\link{read_surveys}}: programmatically read a list of surveys\cr
#' \code{\link{subset_save_surveys}}: programmatically read a list of surveys,
#' and subset them (pre-harmonize the same variables.)\cr
#' \code{\link{pull_survey}}: pull a single survey from a survey list.\cr
#'
#' @section variable name harmonization functions:
#' \code{\link{label_normalize}} removes special characters, whitespace,
#' and other typical typing errors and helps the uniformization of labels
#' and variable names.\cr
#' \code{\link{suggest_permanent_names}}: Suggest the use of variable naming conventions.
#' @section variable label harmonization functions:
#' Create consistent coding and labelling.\cr
#' \code{\link{create_codebook}}: Create a codebook from the original SPSS variable codes and labels.\cr
#' \code{\link{harmonize_values}}: Harmonize the label list across surveys.\cr
#' \code{\link{harmonize_waves}}: Create a list of surveys with harmonized value labels.\cr
#' \code{\link{na_range_to_values}}: Make the \code{na_range} attributes,
#' as imported from SPSS, consistent with the \code{na_values} attributes.\cr
#' @section survey harmonization functions:
#' \code{\link{merge_waves}}: Create a list of surveys with harmonized names and variable labels.\cr
#'
#' @section documentation functions:
#' \code{\link{metadata_create}} and \code{\link{metadata_waves_create}}\cr
#' \code{\link{create_codebook}} and \code{\link{codebook_waves_create}}
#'
#' @section documentation functions:
#' Make the workflow reproducible by recording the harmonization process.
#' \code{\link{document_survey_item}}: Returns a list of the current and historic coding,
#' labelling of the valid range and missing values or range, the history of the variable names
#' and the history of the survey IDs.
#' \code{\link{document_waves}}: Document the key attributes surveys in a survey list.
#'
#' @section type conversion functions:
#' Consistently treat labels and SPSS-style user-defined missing
#' values in the R language.
#' \code{\link{survey}} helps constructing a valid survey data frame, and
#' \code{\link{labelled_spss_survey}} helps creating a vector for a
#' questionnaire item.
#' \code{\link{as_numeric}}: convert to numeric values.\cr
#' \code{\link{as_factor}}: convert to labels to factor levels.\cr
#' \code{\link{as_character}}: convert to labels to characters.\cr
#' \code{\link{as_labelled_spss_survey}}: convert labelled and labelled_spss
#' vectors to labelled_spss_survey vectors.\cr
#' @docType package
#' @importFrom stringr str_extract
#' @import vctrs
#' @import rlang
#' @name retroharmonize
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