Quote:
Originally Posted by gmacaree
Am having exactly the same issue -- I was using a lazy point-fitting technique and came up with an answer matching one of the choices, but then as soon as I used a more rigourous solution for through-the-origin regression I end up with a slope of 1.42. That's obviously incorrect but I'm slightly baffled as to why I get it right when I do it wrong and wrong when I do it right!
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Same here. I used the linear regression-through-the-origin formula and came up with a slope of
. The first time I just used the slope from the line that passes through both points, and got
.
What makes you say that
is obviously incorrect though?