Is anyone familiar with a way to test for differences in the x-intercepts (not y-intercepts) of two simple linear regression lines in R? I'm familiar with a method to calculate standard error estimates of the x-intercept (http://www.mail-archive.com/r-help@r-project.org/msg50241.html), and ANCOVA, which can test for differences in the y-intercepts. Any help would be much appreciated. Thanks, Seth [[alternative HTML version deleted]]
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