#'
#' Calculate the Total TEM given individual intra-observer TEM.
#'
#' @param intra A numeric vector or data frame of individual intra-observer TEM.
#' @param inter A numeric value of inter-observer TEM.
#'
#' @return A numeric value of total TEM
#'
#' @examples
#' # Calculate intra-observer TEM
#' intra <- calculate_tem_cohort(df = smartStd,
#' m1 = "muac1",
#' m2 = "muac2",
#' index = "observer",
#' n = 11)
#'
#' # Get inter-observer TEM
#' muacDF1 <- subset(smartStd,
#' select = c(-muac2, -weight1, -weight2, -height1, -height2))
#' muacDF2 <- subset(smartStd,
#' select = c(-muac1, -weight1, -weight2, -height1, -height2))
#'
#' # Spread the dataset to wide format
#' library(tidyr)
#' muacDF1 <- tidyr::spread(muacDF1, key = "observer", value = "muac1")
#' muacDF2 <- tidyr::spread(muacDF2, key = "observer", value = "muac2")
#' muacDF <- merge(muacDF1, muacDF2, by = "subject")
#' inter <- calculate_team_tem(n = 10, k = 22, m = muacDF[ , 2:23])
#'
#' total_tem <- calculate_total_tem(intra = intra, inter = inter)
#'
#' @export
#'
calculate_total_tem <- function(intra, inter) {
## Get total TEM
total_tem <- sqrt((sum(intra ^ 2) / length(intra)) + (inter ^ 2))
## Return output
total_tem
}
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