Re: [R] Predicting from an nls model

From: Ben Bolker <>
Date: Thu, 12 Jun 2008 12:59:54 +0000 (UTC)

Ranney, Steven <steven.ranney <at>> writes:                                                  

> plot(Weight~Length, data = wae, pch=19,
> xlab="Length (mm)", ylab="Weight (g)",
> xlim = c(150,1000), ylim = c(0, 10050))


> mod = seq(150, 1000)

> lines(mod, predict(pow, list(Weight = mod)))
> The error I get after I submit the final line is:
> Error in xy.coords(x, y) : 'x' and 'y' lengths differ

   Don't you need to specify Length (predictor variable) rather than Weight (response variable) to predict() in this case?

  Ben Bolker mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Thu 12 Jun 2008 - 14:44:58 GMT

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