[R] cbind results to original data frame

From: Ingrid Tohver <itohver_at_u.washington.edu>
Date: Wed, 28 May 2008 18:22:33 -0700


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))))))

What I would like to do is apply the resulting "ts" list to my original data frame so I can perform a goodness of fit test. However, the resulting "ts" is a list only as long as the number of sites (183), so I can't force it to cbind to my original data frame with 49,000 observations. How can I format ts to cbind with dem16 (the original)?

Thank you,
Ingrid



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