[R] Fitting arbitrary curve to 1D data with error bars

[Erkcan Özcan]

Thanks, but if you have another closer look to my post, you will see that my question has nothing to do with drawing error bars on a plot.

What I want is to do a curve fit to a data with error bars.

Best,
e.

On 14 Nov 2013, at 04:21, Suzen, Mehmet wrote:

> If you are after adding error bars in a scatter plot; one example is
> given below :
> 
> #some example data
> set.seed(42)
> df <- data.frame(x = rep(1:10,each=5), y = rnorm(50))
> 
> #calculate mean, min and max for each x-value
> library(plyr)
> df2 <- ddply(df,.(x),function(df)
> c(mean=mean(df$y),min=min(df$y),max=max(df$y)))
> 
> #plot error bars
> library(Hmisc)
> with(df2,errbar(x,mean,max,min))
> grid(nx=NA,ny=NULL)
> 
> (From: http://stackoverflow.com/questions/13032777/scatter-plot-with-error-bars)
>