Table 3.

Summary of linear regression analyses predicting word reading speed for adults.

Step	Predictor	B	ΔR2	Predictor	B	ΔR2	Predictor	B	ΔR2
1	Surface frequency	0.217	0.166ˆ
	Semantic relatedness	-0.242
	N size of base	-0.415
	N size of derived form	0.054
2	Family size	-0.143	0.019	Base frequency	-0.335	0.108∗	Family frequency	-0.171	0.026
3	Family frequency	-0.132	0.009	Family size	-0.043	0.002	Base frequency	-0.360	0.084∗
4	Base frequency	-0.373	0.088∗	Family frequency	0.129	0.006	Family size	-0.111	0.006

ˆp < 0.1, ^∗p < 0.05; reported Beta weights are Step Betas. N, neighborhood. Values at Step 2 show the effects of each of family size, base frequency and family frequency after controlling for surface frequency, semantic relatedness and the neighborhood size of the base word and its derived form. Values at Step 4 show the effects of each of family size, base frequency and family frequency after controlling for surface frequency and semantic relatedness, in addition to the other two variables.