. Author manuscript; available in PMC: 2015 Jan 21.

Published in final edited form as: J Speech Lang Hear Res. 2011 Dec 23;55(1):55–69. doi: 10.1044/1092-4388(2011/09-0257)

Table 3.

Results of piecewise cross-classified random effects growth model for changes in DVAR from G1 through G2.

Fixed effect	Coefficient	SE	df	p
Intercept DVAR, θ₀	68.07	3.38	184	<.001
G2 intercept, θ₁	−24.29	4.48	184	<.001
Time (months), θ₂	−2.07	0.55	184	<.001
G2 × Time, θ₃	2.15	0.75	184	.005

Final estimation of row and Level 1 variance components
Random effect	Variance	df	χ²	p
Intercept β₀₀	132.74	48	246.11	<.001
Time β₂₀	2.77	48	197.28	<.001
Level 1, e	294.37

Final estimation of column level variance components

Intercept c₀₀	14.93	51	62.07	.120

Note. Deviance = 1738.233586. The intercept (θ₀) represents the mean end of G1 student DVAR score (68.07%). Adding the G2 intercept (θ₁) to θ₁ (68.07 – 24.29) yields the mean end of G2 score (43.78%). The time coefficient (θ₂) represents the change in DVAR score per month (so in G1, DVAR decreases 2.07 percentage points per month).