  Panel count data refer to the data arising from studies concerning recurrent
events where study subjects are observed only at distinct time points. If these
study subjects are exposed to recurrent events of several types, we obtain
panel count data with multiple modes of recurrence. In the present paper, we
propose a nonparametric test for comparing cause specific rate functions of
panel count data with more than one mode of recurrence. The test can also be
employed to assess whether the competing modes of recurrence are affecting the
recurrence times identically. We carry out simulation studies to evaluate the
performance of the test statistic in a finite sample setup. The proposed test
is illustrated using two real life panel count data sets, one arising from a
medical follow up study on skin cancer chemo prevention trial and the other on
a warranty database for a fleet of automobiles.
