#' @title Canine-Human Age Equivalent
#' @description Calculates canines equivalent human age (for fun)
#'
#' @param x numeric vector, dog age
#' @return numeric vector, equivalent human age
#'
#' @references
#' Wang, T., J. M, A.N. Hogan, S. Fong, K. Licon et al. (2020) quantitative
#' translation of dog-to-human aging by conserved remodeling of epigenetic
#' networks. Cell Systems 11(2)176-185
#'
#' @author Jeffrey S. Evans <jeffrey_evans@@tnc.org>
#'
#' @examples
#' dat <- data.frame(DogAge = seq(0,18,0.25),
#' HumanAge=chae(seq(0,18,0.25)))[-1,]
#'
#' plot(dat$DogAge, dat$HumanAge, "l",
#' main="Canine-Human Age Equivalence",
#' ylab="Human Age", xlab="Dog Age")
#' points( 15, chae(15), col="red", pch=19, cex=1.5)
#' points( 10, chae(10), col="blue", pch=19, cex=1.5)
#' points( 3, chae(3), col="black", pch=19, cex=1.5)
#' legend("bottomright", legend=c("Camas (15-YO)", "Kele (10-YO)", "Aster (3-YO)"),
#' pch=c(19,19,19), cex=c(1.5,1.5,1.5),
#' col=c("red","blue","black"))
#'
#' @export
chae <- function(x) { round(16 * log(x) + 31, 2) }
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