search for: dem16

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2008 May 29
1
cbind results to original data frame
I have the following script, which gives me a prediction for each of my observations (> 49k), and subsets my data frame by site (n = 183): ts <- (by(dem16,dem16['Site'],function(dat) try(predict(nls(Tw ~ mu + ((alpha - mu)/ (1 + exp(gamma*(B - Mean_air)))), data = dat, start = list(mu = 0.8, alpha = 21.8, gamma = 0.22, B = 12.8), algorithm = "port", lower = list(0,0,0,0))))))...