. Author manuscript; available in PMC: 2020 Apr 1.

Published in final edited form as: J Exp Psychol Gen. 2019 Apr;148(4):739–762. doi: 10.1037/xge0000581

Table 10.

Experiment 2 Summary of Multiple Regression Analysis Explaining Variability in Academic Performance

	Predictor	ΔR²	β	VIF	p
Model 1: Concurrent RI (N = 56)
Step 1		.04			.32
	Age		−.04	1.00	.76
	Gender		−.20	1.00	.14
Step 2		.46^**			< .001
	Age		.01	1.03	.91
	Gender		−.03	1.06	.75
	Self-derivation		.27⁺	1.90	.06
	Verbal Comprehension		.50^*	1.88	< .001
Total adj R²	.47^**
Model 2: Concurrent EOG Math (N = 55)
Step 1		.16^*			.01
	Age		−.10	1.00	.43
	Gender		−.39^*	1.00	.004
Step 2		.22^**			< .001
	Age		−.07	1.04	.56
	Gender		−.26^*	1.08	.03
	Self-derivation		.08	1.88	.61
	Verbal Comprehension		.43^*	1.84	.006
Total adj R²	.33^**
Model 3: Longitudinal RI (N = 43)
Step 1		.02			.65
	Age		.08	1.00	.60
	Gender		−.12	1.00	.45
Step 2		.51^**			< .001
	Age		.001	1.16	.99
	Gender		.03	1.05	.78
	Self-derivation		.16	1.88	.29
	Verbal Comprehension		.62^**	1.96	< .001
Total adj R²	48^**
Model 4: Longitudinal EOG Math (N = 43)
Step 1		.06			.32
	Age		.22	1.00	.16
	Gender		−.08	1.00	.59
Step 2		.48^*			< .001
	Age		.10	1.16	.39
	Gender		.07	1.05	.55
	Self-derivation		.02	1.88	.87
	Verbal Comprehension		.71^**	1.96	< .001
Total adj R²	.49^**

Note:

⁺

indicates p < 0.06,

indicates p ≤ .05,

^**

indicates a p ≤ .001;

Beta weights are standardized.