[R] Significance of slopes
Christian Arnold
chrarnold at web.de
Tue Dec 9 21:54:23 CET 2008
Hello R community,
I have a question regarding correlation and regression analysis. I have
two variables, x and y. Both have a standard deviation of 1; thus,
correlation and slope from the linear regression (which also must have
an intercept of zero) are equal.
I want to probe two particular questions:
1) Is the slope significantly different from zero? This should be easy
with the lm function, as the p-value should reflect exactly that
question. If I am wrong, lease correct me.
2) Is the slope significantly different from a non-zero value (e.g.
0.5)? How can I probe that hypothesis? Any ideas?
I apologize if this question is too trivial and already answered
somewhere, but I did not find it.
Thank you for the help!
Christian
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