Table 1.

Examples of categorical and ordinal scatter

Categorical scatter

(from Walden et al., 2012)

Presence/absence of multiple basal runs of correct items separated by one or more incorrect item Child A→ 1, 1, 1, 1, 1, 0, 0, 0 = no scatter Child B→ 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 0 = scatter

Ordinal scatter

(from Kaplan et al., 1991)

Absolute difference between consecutive item scores on a test Child A→ 1, 1, 1, 1, 1, 0, 0, 0 = 1 scatter point Child B→1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 0 = 5 scatter points