The value on the vertical axis scale around which a set of behavioral measures converge is called level (Cooper, Heron & Heward, 2007, pp. 150-151).

"The overall direction taken by a data path is its trend" (Cooper, Heron & Heward, 2007, p. 151).

"How often and the extent to which multiple measures of behavior yield different outcomes is called variability" (Cooper, Heron & Heward, 2007, p. 150).