#'
#' This is a background/internal function called by \code{WP}. It computes the log-likelihood.
#'
-#' @param NT vector of case counts
-#' @param p discretized version of the serial distribution
-#' @param R0 basic reproductive ratio
-#' @return The function returns the variable \code{LL} which is the log-likelihood at the input variables and parameters.
+#' @param NT Vector of case counts.
+#' @param p Discretized version of the serial distribution.
+#' @param R0 Basic reproductive ratio.
+#'
+#' @return This function returns the log-likelihood at the input variables and parameters.
+#'
+#' @keywords internal
+computeLL <- function(p, NT, R0) {
+ k <- length(p)
+ TT <- length(NT) - 1
+ mu_t <- rep(0, TT)
-#' @export
-#
-computeLL <- function(p, NT, R0){
+ for (i in 1:TT) {
+ Nt <- NT[i:max(1, i-k+1)]
+ mu_t[i] <- sum(p[1:min(k, i)] * Nt)
+ }
- k <- length(p)
- TT <- length(NT)-1
- mu_t <- rep(0, TT)
- for(i in 1:TT){
- Nt <- NT[i:max(1,i-k+1)]
-# print(Nt)
-# print(p[1:min(k,i)])
- mu_t[i] <- sum(p[1:min(k,i)]*Nt)
- }
- mu_t <- R0*mu_t
- LL <- -sum(mu_t)+sum(NT[-1]*log(mu_t))
+ mu_t <- R0 * mu_t
+ LL <- sum(NT[-1] * log(mu_t)) - sum(mu_t)
return(LL)
-
}
-
-