. Author manuscript; available in PMC: 2024 Jan 26.

Published in final edited form as: Dev Psychol. 2012 Mar 5;48(5):1229–1241. doi: 10.1037/a0027433

Table 6.

Regression Models Predicting Approximate Symbolic Calculation Skill and Number Line Knowledge From Measures of Spatial Skill, Number Line Knowledge, and Vocabulary in Study 2 (N = 42)

	Approximate symbolic calculation			Number line linear R² (0–100)^a
Measure	Model 5	Model 6	Model 7	Model 8
Spatial skill	.34^*		.16	.35^*
Number line linear R² (0–100)^a		.57^***	.51^**
Vocabulary knowledge	.32^*	.20	.16	.31^*
R² (%)	30.4	46.5	48.2	31.4
F	8.5^**	17.0^***	11.8^***	8.9^**
F dfs	(2, 39)	(2, 39)	(3, 38)	(2, 39)

Note. Parameter estimates are standardized for all data.

These variables have been transformed using an arcsine transformation {2 × asin[sqrt(x)]}.

p < .05.

^**

p < .01.

^***

p < .001.