Re: [R] how to draw confidence interval lines of a fitted curve of polynominal regression

Hello, You should follow the posting guide and provide us with a data and code example. # Make up some data x <- seq(0, 1, length.out = 20) y <- x^2 + rnorm(20) # fit a quadratic model <- lm(y ~ I(x^2)) fitted <- predict(model, interval = "confidence") # plot the data and the fitted line plo

Re: [R] how to draw confidence interval lines of a fitted curve of polynominal regression

Hi Elaine you can do all at one go using the ggplot2-package library(ggplot2) qplot(age,weight)+ geom_smooth(method="lm",formula=y~poly(x,2)) Have a look at ?geom_smooth when you want to incooperate customized model predictions cheers. Am 07.02.2013 02:31, schrieb Elaine Kuo: > Hello, > > I dr

[R] how to draw confidence interval lines of a fitted curve of polynominal regression

Hello, I drew a plot of weight and height of people and fitted it with a polynominal regression x^2. (using curve()) Now I would like to draw the confidence interval line for the fitted curve. Please kindly advise the code for the purpose. Thank you. Elaine [[alternative HTML version de