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The commands in this section take vectors as arguments and compute
various statistical measures on the data stored in the vectors. The
references used in the definitions of these functions are Bevington's
*Data Reduction and Error Analysis for the Physical Sciences*,
and *Numerical Recipes* by Press, Flannery, Teukolsky and
Vetterling.

The statistical commands use the `u` prefix key followed by
a shifted letter or other character.

See Manipulating Vectors, for a description of `V H`
(`calc-histogram`

).

See Curve Fitting, for the `a F` command for doing
least-squares fits to statistical data.

See Probability Distribution Functions, for several common probability distribution functions.