. Author manuscript; available in PMC: 2016 Oct 1.

Published in final edited form as: Learn Individ Differ. 2015 Oct 1;43:164–169. doi: 10.1016/j.lindif.2015.08.020

Table 3.

Hierarchical Regression Analyses of Memory Performance Predicting Math Achievement

	R	R²	R²Δ	FΔ	F	β	t	sr²
a. Dependent variable: Math Fluency
Step 1.	.32	.10			4.52^*
Verbal IQ						.17	1.57	.03
Age						.28	2.58^*	.08
Step 2:	.47	.22	.12	5.45^**	5.46^***
Verbal IQ						.09	.80	.01
Age						.17	1.56	.03
Working Memory						.23	2.11^*	.05
Recollection						.23	1.99^*	.04

b. Dependent variable: Calculation
Step 1.	.56	.32			18.12^***
Verbal IQ						.28	2.99^**	.08
Age						.49	5.26^***	.24
Step 2:	.62	.39	.07	4.17^*	11.88^***
Verbal IQ						.22	2.37^*	.05
Age						.41	4.33^***	.15
Working Memory						.20	2.14^*	.04
Recollection						.14	1.40	.02

Note:

^***

p ≤ .001;

^**

p ≤ .01;

p ≤ .05.

Math Fluency (n= 81), Calculation (n= 81).