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...(shown by the red error bars). I'm assuming a gaussian distribution for each point with equal variance so I believe I can just take the linear regression of the mean values. And as this is not a continuous line, does that make a difference when I do the regression? http://www.nabble.com/file/p19761963/bridgers.jpg bridgers.jpg -- View this message in context: http://www.nabble.com/Linear-Regression-in-R-tp19761963p19761963.html Sent from the R help mailing list archive at Nabble.com.