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+:mod:`altgraph.GraphStat` --- Functions providing various graph statistics
+==========================================================================
+
+.. module:: altgraph.GraphStat
+   :synopsis: Functions providing various graph statistics
+
+The module :mod:`altgraph.GraphStat` provides function that calculate
+graph statistics. Currently there is only one such function, more may
+be added later.
+
+.. function:: degree_dist(graph[, limits[, bin_num[, mode]]])
+
+   Groups the number of edges per node into *bin_num* bins
+   and returns the list of those bins. Every item in the result
+   is a tuple with the center of the bin and the number of items
+   in that bin.
+
+   When the *limits* argument is present it must be a tuple with
+   the mininum and maximum number of edges that get binned (that
+   is, when *limits* is ``(4, 10)`` only nodes with between 4
+   and 10 edges get counted.
+
+   The *mode* argument is used to count incoming (``'inc'``) or
+   outgoing (``'out'``) edges. The default is to count the outgoing
+   edges.