TABLE 3.

Parameter Estimates for the Three-Group SEM Tree Latent Basis Growth Model

	g = 1	g = 2	g = 3
Means (α)
1→η1	32.41	36.41	44.04
1→η2	124.29	141.23	148.57
Shape loadings (Λ)
η2 → read1 (fall of k)	= 0	= 0	= 0
η2 → read2 (spring of k)	0.092	0.093	0.080
η2 → read3 (fall of 1st)	0.136	0.145	0.136
η2 → read4 (spring of 1st)	0.336	0.353	0.347
η2 → read5 (spring of 3rd)	0.656	0.708	0.742
η2 → read6 (spring of 5th)	0.849	0.860	0.884
η2 → read7 (spring of 8th)	= 1	= 1	= 1
Variances and covariances (Ψ)
η2 ↔η1	39.22	40.86	268.99
η2 ↔η2	420.99	281.64	272.68
η1 ↔η2	39.11	15.55	−199.29
Unique factor variances (Θ)
θ11	7.90	7.36	99.84
θ22	26.78	58.10	14.38
θ33	68.67	98.27	78.99
θ44	124.17	227.27	250.47
θ55	139.54	145.85	185.122
θ66	77.45	80.38	101.32
θ77	353.45	177.88	40.99

Note. We do not present p values for each parameter for two reasons: (a) they are not output by the semtree package; and (b) given the number of splits searched, any resultant p values might reflect biased estimates given the adaptive nature to the search procedure.