% error of line of best fit

[factorial]

Is there a better/cleverer way of calculating the error (e.g. percentage error) of a line of best fit.

at present we\'re doing:
import data
line of best fit
create data points
import original data and datapoints into excel. match up the x values and calculate the %error on the y values.

there must be a better way no ?
Thank you, Lily

[Simon]

Dear Lily (factorial!),

This was a very interesting question. There is a very simple way of looking at the squared residuals in Autograph but we do not simply provide the individual error values for each data point. However there are two ways which you might choose to find them, I have shown this in the following video:

http://screencast.com/t/eln24yll

Hope it helps,

Simon