[R] for loop in nls function

From: Ingrid Tohver <itohver_at_u.washington.edu>
Date: Tue, 29 Apr 2008 14:22:23 -0700

I am trying to apply a least squares non-linear regression to my dataset, dem16. I can apply it to a subset based on a single site fine, but I want to apply it to each (of 197) sites. I am stumbling over a "for" loop. Site and Mean_Air are variables in my dataset and I would like to estimate alpha, beta, gamma, mu and Tw for each site. I have over 50,000 observations in my dataset.

results <- c()
for (i in Site) {
results[i]<- nls(Tw ~ mu + ((alpha - mu)/(1 + exp(gamma*(B - Mean_Air)))),

	data = dem16,
	start = list(mu = 0.0001, alpha = 21.8, gamma = 0.22, B = 12.8))

Thank you in advance,

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