emm_list classAn emm_list object is simply a list of
emmGrid objects. Such a list is returned,
for example, by emmeans with a two-sided formula or a list as its
specs argument.
Methods for emm_list objects include summary,
coef, confint, contrast, pairs, plot,
print, and
test. These are all the same as those methods for emmGrid
objects, with an additional which argument (integer) to specify which
members of the list to use. The default is which = seq_along(object);
i.e., the method is applied to every member of the emm_list object.
The exception is plot, where only the which[1]th element is
plotted.
As an example,
to summarize a single member -- say the second one -- of an emm_list,
one may use summary(object, which = 2), but it is probably preferable
to directly summarize it using summary(object[[2]]).