Hello, I have fitted two curves to the data. How can I tell which one is more fitted? By eye (see plot underneath) I would say that the function Gompertz is better than the function Holling type III; how can I give a number to this hunch? This is an example: ``` # functions holling = function(a, b, x) { y = (a * x^2) / (b^2 + x^2) return(y) } gompertz = function(a, b, c, x) { y = a * exp(-b * exp(-c * x)) return(y) } # data actual <- c(8, 24, 39, 63, 89, 115, 153) holling <- c(4.478803, 17.404533, 37.384128, 62.492663, 90.683630, 120.118174, 149.347683) gompertz <- c(11.30771, 22.39017, 38.99516, 61.19318, 88.23403, 118.77225, 151.19849) # plot plot(1:length(actual), actual, lty = 1 , type = "l", lwd = 2, xlab = "Index", ylab = "Values") points(1:length(actual), holling, lty = 2, type = "l", col = "red") points(1:length(actual), gompertz, lty = 3, type = "l", col = "blue") legend("bottomright", legend = c("Actual values", "Holling III", "Gompertz"), lty = c(1, 2, 3), lwd = c(2, 1,1), col = c("black", "red", "blue")) ``` Thank you
______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.