This plots an ETA covariance matrix which can be used to define the co-relation between the parameters and its shrinkage
# S3 method for eta_cov
plot_pmx(x, dx, ...)eta_cov object
data set
not used for the moment
ggplot2 plot
Other plot_pmx: distrib,
eta_cov, eta_pairs,
individual, plot_pmx.distrib,
plot_pmx.eta_pairs,
plot_pmx.individual,
plot_pmx.pmx_dens,
plot_pmx.pmx_gpar,
plot_pmx.pmx_qq,
plot_pmx.residual, plot_pmx