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#' @name ammonia
#' @aliases ammonia
#'
#' @title Ammonia oxidized to acid nitric data set
#'
#' @description The data come from experiments with a plant where ammonia is oxidized to acid nitric.
#'
#' @format A data-frame with 21 observations and 4 columns:
#'
#' \itemize{
#' \item \code{stackloss}: the percentage of ammonia lost.
#' \item \code{airflow}: the air flow to the plant.
#' \item \code{watertemp}: the cooling water inlet temperature.
#' \item \code{acidconc}: the acid concentration.
#' }
#'
#' @author Josmar Mazucheli \email{jmazucheli@gmail.com}
#'
#' @author Bruna Alves \email{pg402900@uem.br}
#'
#' @usage data(ammonia, package = "ugomquantreg")
#'
#' @references
#'
#' Brownlee, K. A., (1965). Statistical Theory and Methodology in Science and Engineering. \emph{New York: John Wiley & Sons}.
#'
#' Yu, K., and Moyeed, R. A., (2001). Bayesian quantile regression. \emph{Statistics and Probability Letters}, \bold{54}(4) 437--447.
#'
#' @source \url{https://support.sas.com/rnd/app/stat/examples/BayesQuantile/quantile.htm}
#'
#' @examples
#' data(ammonia, package = "ugomquantreg")
#'
#' library(gamlss)
#'
#' tau <- 0.50
#' fit.logit <- gamlss(stackloss ~ airflow + watertemp + acidconc, data = ammonia,
#' family = UGOM(sigma.link="identity"))
#'
#' tau <- 0.50
#' fit.probit <- gamlss(stackloss ~ airflow + watertemp + acidconc,
#' data = ammonia, family = UGOM(mu.link = "probit", sigma.link = "log"))
#'
#' fittaus <- lapply(c(0.10, 0.25, 0.50, 0.75, 0.90), function(Tau){
#' tau <<- Tau;
#' gamlss(stackloss ~ airflow + watertemp + acidconc, data = ammonia,
#' family = UGOM(mu.link = "logit", sigma.link = "log"))
#' })
#'
#' sapply(fittaus, coef)
"ammonia"
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