pairs: Create a pairs plot for an MCmcmc object
In MethComp: Analysis of Agreement in Method Comparison Studies

Create a pairs plot for an MCmcmc object

## S3 method for class 'MCmcmc'
pairs(
  x,
  what = "sd",
  subset = NULL,
  col = NULL,
  pch = 16,
  cex = 0.2,
  scales = "free",
  ...
)

`x`	An `MCmcmc` object.
`what`	Character indicating what parameters to plot. Possible values are `"sd"` or `"var"` which gives plots for the variance components (on the sd. scale), `"beta"` or `"slope"`, which gives plots for slope parameters and `"alpha"` or `"int"`, which gives plots for the intercept parameters.
`subset`	Character or numerical indicating the columns of the posterior that should be plotted by `pairs`.
`col`	Color of the lines points used for plotting of the posterior densities.
`pch`	Plot symbol for the points.
`cex`	Plot character size for points in `pairs`.
`scales`	Character vector of length two, with possible values "same" or "free", indicating whether x- and y-axes of the plots should be constrained to be the same across panels. For `pairs` only the first element is used to decide whether all panles should have the same axes.
`...`	Further aruments passed on to the `Lattice` function called: `trace` calls `xyplot` from the `coda` package, `post` calls `densityplot` from the `coda` package, calls `pairs` from the `graphics` package.