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. Author manuscript; available in PMC: 2014 Oct 2.
Published in final edited form as: GI Ed Proc. 2009;157:163–172.

Figure 1.

Figure 1

Unreliable NC estimation of the heterogeneity of an interaction from observations under two conditions. Left: An interaction with a coefficient vector, (a, b), which might shift under two conditions; Center: The observations, (O1, O2), led to estimation of a large, but insignificant, difference between the coefficient vectors. (P1, P2) are model predictions; Right: The observations, (O1, O2), let to estimation of a small, but significant, difference between the coefficient vectors.(P1, P2) are model predictions.