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#' rspiro: Brief overview of the package
#'
#' @description
#' R package \bold{rspiro} implements multiple spirometry equations:
#' currently the GLI-2012 (Quanjer), GLI global 2022, JRS-2014,
#' NHANES III (Hankinson), as well as the GLI-2017 diffusing capacity equations
#' (Stanojevic et al). More may be added later. It offers a convenient interface
#' to calculate predicted or LLN (Lower Limit of Normal) values given
#' demographic data, or to convert absolute values to percent (%)
#' predicted or z-scores.
#'
#' @details
#' To ensure a consistent interface,
#' package functions are named with a prefix indicating the functionality
#' and a suffix indicating the spirometric equations used, for example
#' \code{\link{LLN_GLI}} calculates Lower Limits of Normal using the GLI-2012
#' equations. The suffix is currently one of 'GLI', 'GLIgl', 'JRS', 'NHANES3' or 'GLIdiff'.
#' The prefix is one of 'LLN_', 'pred_', 'pctpred_' or 'zscore_'.
#'
#' Functions
#' prefixed 'LLN_' or 'pred_' accept as input demographic information (age,
#' gender, height, ethnicity) and calculate the Lower Limit of Normal and
#' the predicted value, respectively, for a given spirometry parameter (FEV1,
#' FVC, etc).
#' Functions prefixed 'pctpred_' or 'zscore_' accept absolute spirometry
#' values (plus demographics) and convert those to percent (%) predicted and
#' z-scores, respectively.
#' Please note the difference between 'pred_' and 'pctpred_' above.
#'
#' For detailed information, refer to the respective function documentations.
#'
#' The development version of \bold{rspiro} is available on GitHub
#' \url{https://github.com/thlytras/rspiro}.
#' To report problems and bugs, or to request a feature, please go
#' there and open an issue. Alternatively, send an email to
#' Theodore Lytras \email{thlytras@@gmail.com}.
#'
#' @name rspiro-package
#'
#' @aliases rspiro-package rspiro
#'
#' @author Theodore Lytras \email{thlytras@@gmail.com}.
#'
#' @keywords package
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