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74 Statistics Graphics Toolkit
ANOVA Statistics Subscript Functions
an_msw mean square within
an_msb
an_ssw
an_ssb
an_sst
an_dfw
an_dfb
an_dft
an_f
an_p
mean square between
sum of squares within
sum of squares between
sum of squares total
degrees of freedom within
degrees of freedom between
degrees of freedom total
F-statistic
Prob(F)
PrintAnova (#n, d(,))
PrintAnova computes a one-factor analysis of variance from the data points d(,) and
prints an ANOVA table from the results. Each column of d(,) is taken as one dataset, so
“within” refers to columns and “between” refers to rows. If you want to get fancier, try
the PrintMultiRegress routine.
Channel #n must already be open. It can refer to a window or a text file. Pass #0 to
print in the current window.
Exceptions:
7004 Channel isn’t open.
8501 Must be text file.
MedFit (x(), y(), slope, inter, mad,resid())
MedFit computes a “median” (least absolute deviation) linear fit of the dependent variable
y() to the independent variable x(). The x() and y() arrays must have the same sizes
but needn’t have the same upper and lower bounds; they’re taken as paired data points
(x i
, y i
) starting with the first element of each array. If either number in a pair is missing,
the pair is not used.
MedFit is like LSFit except that it uses a more “robust” technique so that outliers have
less effect on the fitted line. It is, however, significantly slower than LSFit.
MedFit returns the slope and intercept of the fitted line in slope and inter, the mean
absolute deviation mad, and the residuals in resid().
Use SetLineFit to switch to using least-absolute-deviation fits instead of least-squares
fits in scatter and regression plots.
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