Excel 2007 Analysis Toolkit Regression

  • Thread starter Thread starter FDSingleton
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FDSingleton

I teach statistics and am finding that in the "Line Fit Plot", a very
important part of regression output, has the line in error for Excel 2007 but
not for Excel 2000 and 2003, both of which I have been using for years with
my classes. In all 3 versions of Excel the "Line Fit Plot" has to be
adjusted through menus to make it show a line, but when this is done for the
2007 version, the line looks somewhat reasonable but is actually in error! I
did not catch this until I started grading my students' computer homeworks
and found they all had the same incorrect lines. This is a serious error.
 
FDSingleton said:
I teach statistics and am finding that in the "Line Fit Plot", a very
important part of regression output, has the line in error for Excel 2007 but
not for Excel 2000 and 2003, both of which I have been using for years with
my classes. In all 3 versions of Excel the "Line Fit Plot" has to be
adjusted through menus to make it show a line, but when this is done for the
2007 version, the line looks somewhat reasonable but is actually in error! ...
Click to expand...

What apparently happens is that the line and the fitted points are plotted
with independently different scalings, whereas the whole point of a line fit
plot is to use the SAME coordinates for both line and points to see how they
lie relative to each other.
 
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