Produces diagnostic plots for the leave-one-out analysis.
type = "xi"Horizontal bar plot of \(\Delta\xi\) for each dropped observation/country, sorted by value. Blue bars indicate positive change (dropping the obs increases the estimate); red bars indicate negative change (dropping the obs decreases the estimate).
type = "coef"DFBETA plots: one panel per coefficient showing \(\Delta\beta_j\) for each observation. Points beyond \(\pm 2 \, \mathrm{SD}\) are highlighted in red.