Table 4.

Summary of fixed effects for the model: coefficient estimates (β̂), standard errors, associated Wald z-scores, and significances (from a Wald test). Significances smaller than 0.01 are bolded. Predictors are grouped as in Table 3.

Predictor	β̂	SE(β̂)	z	p
Intercept	−2.96	0.11	−27.28	< 0.0001
1. Time
age1 (component 1)	1.08	0.051	21.32	< 0.0001
age2 (component 2)	4.52	0.19	23.83	< 0.0001
2. Child-level variables
female child	0.26	0.11	2.44	0.015
caregiver vocab. size	0.34	0.11	3.11	0.0019
3. Word-level variables
Network-theoretic properties
degree’	0.22	0.051	4.25	< 0.0001
clustering coefficient	−0.059	0.043	−1.36	0.17
coreness’	−0.38	0.14	−2.73	0.0063
Other properties
length	−0.20	0.051	−3.88	0.00011
frequency	0.90	0.041	22.29	< 0.0001
phon. probability’	0.0094	0.010	0.92	0.36
part of speech = noun vs. mean	0.38	0.058	6.49	< 0.0001
= verb vs. mean	−0.20	0.060	−3.29	0.0010
= modifier vs. mean	0.051	0.064	0.80	0.43
4. Interactions
age1:length	−0.042	0.028	−1.50	0.13
age2:length	−0.097	0.10	−0.97	0.33
age1:degree’	−0.15	0.029	−5.18	< 0.0001
age2:degree’	−0.46	0.11	−4.37	< 0.0001
age1:clustering coefficient	0.054	0.024	2.20	0.028
age2:clustering coefficient	0.19	0.093	2.09	0.037
age1:coreness’	0.22	0.081	2.72	0.0065
age2:coreness’	0.34	0.29	1.18	0.24