14. The non-transitory machine-readable storage medium of claim 9 , wherein the step of assigning the search query to a subset of the one or more verticals further comprises: plotting each difference in the set of differences and a corresponding coverage adjusted log likelihood as a set of points on a plane for a particular vertical of the one or more verticals; defining an area on the plane; and assigning the search query represented by the set of points to the particular vertical if the point is within the area.
14. The non-transitory machine-readable storage medium of claim 9 , wherein the step of assigning the search query to a subset of the one or more verticals further comprises: plotting each difference in the set of differences and a corresponding coverage adjusted log likelihood as a set of points on a plane for a particular vertical of the one or more verticals; defining an area on the plane; and assigning the search query represented by the set of points to the particular vertical if the point is within the area. 15. The non-transitory machine-readable storage medium of claim 14 , wherein the area is defined by a line.