You don't provide a reproducible example, but my first guess is that the print method is rounding what appears on the screen, so you aren't actually using the slope and intercept. See ?print.default and the digits argument under ?options for more.
Why do you need to copy and paste the coefficients? Just to check your understanding? Sarah On Thursday, December 13, 2012, Robert U wrote: > Hello fellow > R-users, > > Im stuck > with something i think is pretty stupid, but i cant find out where im > wrong, > and its turning me crazy! > > I am doing > a very simple linear regression with Northing/Easting data, then I plot the > data as well as the regression line : > > > plot(x=Dataset$EASTING, > y=Dataset$NORTHING) > > fit <- lm(formula = NORTHING ~ EASTING, > data = Dataset) > > abline(fit) > > fit > > Call: > lm(formula = NORTHING ~ EASTING, data = > Dataset) > > Coefficients: > (Intercept) EASTING > 5.376e+05 4.692e-02 > > Later on, when I use the > command abline with the coefficient provided by summary(fit), the line > is > not the same as abline(fit) ! > > To summarize, > those two lines are different: > > > abline(fit) > > > abline(5.376e+05, 4.692e-02) > > The b coefficients > appear equal, but the intercepts are different. > > Where am I missing > something? L > > Thanks > [[alternative HTML version deleted]] > > -- Sarah Goslee http://www.stringpage.com http://www.sarahgoslee.com http://www.functionaldiversity.org [[alternative HTML version deleted]]
______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
