dissimilarity matrix or object of class dist. Explanatory dissimilarities (often these will be proper distances, but more general dissimilarities that do not necessarily fulfill the triangle inequality can be used, same for dmy).

dissimilarity matrix or object of class dist. Response dissimilarities.

something that can be coerced into a factor, defining the grouping of objects represented by the dissimilarities dmx and dmy (i.e., if grouping has length n, dmx and dmy must be dissimilarities between n objects).

Vector of two levels. The two groups defining the regressions to be compared in the test. These can be factor levels, integer numbers, or strings, depending on the entries of grouping.

vector of four colors (or color numbers) to be used for plotting distances and regression lines within the first group, within the second group, distances between groups, and a line marking the center of the between-groups explanatory distances, see col-argument of par.

vector of three plot symbols (or numbers) to be used for plotting distances within the first group, within the second group, and distances between groups, see pch-argument of par.

vector of line type numbers to be used for single group within-group regression, both groups combined within-group regression, regression with all distances, and regression combining within-groups distances of one group with between-groups distances, see lty-argument of par.

if TRUE, within-groups distances regression lines are shown for both groups.

if TRUE, the within-groups distances regression line for both groups combined is shown.

if TRUE, the regression line based on all distances is shown.

if TRUE, the regression lines combining within-groups distances of one group with between-groups distances are shown (the colors of these are the colors of the individual groups, the first two components of the cols-argument).

if TRUE, points are jittered to avoid overplotting.

if TRUE, a line is plotted to mark the center of the between-groups distances on the explanatory variable.

to be passed on to plot; the default is determined from the involved distances.

to be passed on to plot; the default is determined from the involved distances.

to be passed on to plot.

to be passed on to plot.

optional arguments to be passed on to plot.