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Quantile-quantile plot

`qqplot(x)`

`qqplot(x,pd)`

`qqplot(x,y)`

`qqplot(___,pvec)`

`h = qqplot(___)`

`qqplot(`

displays
a quantile-quantile plot of the quantiles of the sample data `x`

)`x`

versus
the theoretical quantiles values from a normal distribution. If the
distribution of `x`

is normal, then the plot appears
linear.

`qqplot(___,`

displays
a quantile-quantile plot with the quantiles specified in the vector `pvec`

)`pvec`

,
using any of the previous syntaxes.

returns
the handles (`h`

= qqplot(___)`h`

) to the lines in the quantile-quantile
plot.

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