Probability plots

`probplot(y)`

creates a normal probability
plot comparing the distribution of the data in `y`

to
the normal distribution. The plot includes a reference line useful
for judging whether the data follows a normal distribution.

`probplot(`

creates
a probability plot for the distribution specified by `dist`

,___)`dist`

,
using any of the previous syntaxes.

`probplot(___,'noref')`

omits
the reference line from the plot.

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