likert
.
likert.bar.plot(l, group.order, center = (l$nlevels - 1)/2 + 1, ...)
likert
.center = 3
would use the third level as the center whereas
center = 3.5
would indicate no specific level is the center but
<= 3="" are="" low="" levels="" and="">= 4 are high levels (i.e. used for forced choice
items or those without a neutral option). This also influences where the
color breaks from low to high.=>likert.options
likert.heat.plot
likert.bar.plot
likert.density.plot