Plot variable correlations

`corrplot(`

creates
a matrix of plots showing correlations among pairs of variables in `X`

)`X`

.
Histograms of the variables appear along the matrix diagonal; scatter
plots of variable pairs appear off diagonal. The slopes of the least-squares
reference lines in the scatter plots are equal to the displayed correlation
coefficients.

`corrplot(`

uses
additional options specified by one or more `X`

,`Name,Value`

)`Name,Value`

pair
arguments.

returns
the correlation matrix of `R`

= corrplot(___)`X`

displayed in the plots.
You can use any of the previous input arguments.

`collintest`

| `corr`

| `gname`

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