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Re: st: riddle
On Dec 19, 2007, at 8:03 AM, Maarten buis wrote:
In a previous post I claimed that the x-s in the graph below represent
the regression line (of x1 on x2, though I did not specify that
explicitly). Assuming that each symbol represent a datapoint, than
this
is a mistake. It is a minor point, and does not change the point I
made
in that previous post.
Does anybody else see my mistake? (maybe a nice exam question?)
| *x*
| **x**
| **x**
x1| **x**
| **x**
|**x**
|*x*
---------------
x2
Either your editor has rotated (and flipped?) your figure, or you
have developed a "new technique" that minimizes the *horizontal*
distance between observations and the "regression line". (I suspect
some of us might call that regression of x2 on x1. I'm not so sure
I'd characterize the difference as minor, however, especially in an
introductory course: it cuts to the core of what a regression line
represents.)
Agreed, a good ex*m question!
-- Mike
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