Hi guys,
This is my first post in this group. It is great that there is such
a group!
What I want to do right now is like this:
Say, I have four columns of data, Column A, B, C and D, the latter
three depend on Column A, there are 4 rows in each column
I want to do interpolation and extrapolation to the four columns,
mainly based on Column A, thus the other 3 columns can be
interpolated/extrapolated.
The way to do that is through curve-fitting, because linear
interpolation may not work me, so I want need to get a curvefit for Column
B vs. A, Column C vs. A, and Column D vs. A, respectively. There must be a
macro that can take and record the individual coefficients in the curve
function for each of the fitting curve.
After the curve fittings are done, I can use the coefficients of
the functional form to interpolate, extrapolate. Finally I will have
another table--an extended table to tabulate all of the calculated data.
About the curve fitting, I would like to start with polynomial, but
not sure whether to start with cubic of fifth order first. One thing that
may help me decide is to check some quantity to check the quality of the
curve fitting, say, a t-test and/or F-test, if a cubic polynomial does not
yield good data, I can switch to fifth order polynomial.
As I'm totally new to macros, I'm confused about the way to do the
macros. I know that I can make macros through recording, but I'm not sure
if I can realize that without doing some macro coding (for instance,
getting the individual coefficients of the curve-fitting functions, and
checking the curve fitting quality to make decision whether to switch curve
function or not, etc.) I guess I may need to write some macro coding to
insert in my recorded macro to make it work, but I don't know where to
start.
If you guys have some examples to show me, I would really
appreciate it!
Thanks,
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