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Jeff,
Thanks for the shared reference:
http://www.chem.utoronto.ca/coursenotes/analsci/StatsTutorial/
ErrRegr.html
I like it, except for one detail. The predicting variable y (what is
measured is fluorescence) was plotted vertically while the inferred
variable (concentration) is plotted horizontally. Their formula to
calculate standard deviation of the inferred variable contains the
slope of the line, b.
My predicting (independent) variable, r, is plotted horizontally while
the inferred (dependent) variable is plotted vertically. That seems to
be more logical.
But that is not the main point. I think that what
they call slope b (in the formula for the standard deviation of the
predicted concentration) should be replaced by 1/b', where b' is the
slope of my line. I will try to do this later and see if our results
agree. What was the numerical value of b that you used in their
formula? _______________________________________________________