#'Dataset of happiness in chapter14
#'
#'A dataset containing happy,money,sex,love,work of 24 objects
#'
#'@format a dataframe with 24 rows and 5 variables
#'\describe{
#' \item{happy}{1~10:the degree of happiness,and 10 is the happinest}
#' \item{money}{family income,1000$ per unit}
#' \item{sex}{lover,1:yes;0:no}
#' \item{love}{emotional index,1:lonely;2:stable relationship;3:strong relationship}
#' \item{work}{work index,1:no work;3:ok;5:work well}
#'}
"happy"
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