Table 3.2.

Final growth curve model parameter estimates for Broad Reading Cluster W-scores in English (BRE) and Spanish (BRS)

Parameter	UG-BRE	CG-BRE	UG-BRS	CG-BRS
Fixed Effects: γ (SE)
Intercept [γ00]	472.6b (0.7)	477b (0.7)	478.8b (1.1)	497.3b (0.8)
Linear slope [γ10]	0.97b (0.08)	1.3b (0.08)	1.7b (0.3)	1.6b (0.3)
Quadratic slope [γ20]	−0.1b (0.004)	−0.1b (0.004)	0.15a (0.05)	0.15a (0.05)
Cubic slope [γ30]			0.01b (0.002)	0.01b (0.002)
20% BR@Grade 2 [γ01]		−37.4b (1.5)		−59.6b (1.8)
English instruction (Ei) [γ02]		4b (1.1)		−19.1b (1.5)
20% BR × linear slope [γ11]		−0.38b (0.08)		−0.91b (0.11)
Ei × linear slope [γ12]		−0.75b (0.06)		0.94b (0.09)
Variance Components: σ (SE)
Within-person variance [σε2]	132b (3.4)	124.7b (3.2)	238b (6.1)	229.9b (5.9)
B/w-person intercept σ02]	438b (19.3)	246.5b (11.5)	1223.3b (52.9)	336b (16.6)
Proportional Variance Reduction
Within-person variance [Rε2]	79%	80%	59%	61%
B/w-person intercept [$R_0^2$]		44%		73%
Goodness-of-Fit
−2LL	36,312.2b	35,499.6b	38,802.4b	37,288.3b
BIC	36,354	35,574.9	38,852.5	37,371.8

Note. The proportional variance reduction of within-person variance [R^ε2] for the best fitting unconditional and conditional growth curve models was calculated based on the within-person variance of the unconditional means model (not shown) for each measure. UG = best fitting unconditional growth curve model; CG=best fitting conditional growth curve model;BRE=broad reading cluster in English (BRE); and BRS = broad reading cluster in Spanish of the Woodcock Language Proficiency Battery-Revised (Woodcock, 1991; Woodcock & Muñoz-Sandoval, 1995); 20% BR_{@Grade 2} = W-score performance at the 20th percentile at the end (spring semester) of Grade 2 in the broad reading cluster; −2LL = −2 log-likelihood deviance statistic; BIC = Schwarz’ Bayesian information criterion.

^ap < .01.

^bp < .001.