Table 4.

Comparison of linear, logarithmic, and quadratic models for usage variables included in the linear regression.

Usage variable and model		Unstandardized coefficients		Standardized coefficients	F (df)	P	Adjusted R 2
		B	SE	β
Activities completed per log-in
	Linear	0.217	0.070	0.208	9.61 (1,212)	.002	0.039
	Logarithmic	0.105	0.040	0.178	6.98 (1,212)	.009	0.027
	Quadratic	0.023	0.101	0.044	4.81 (2,211)	.009	0.035
Total time spent online
	Linear	0.000	0.000	0.142	4.38 (1,212)	.04	0.016
	Logarithmic	0.114	0.047	0.163	5.79 (2,212)	.02	0.022
	Quadratic	0.001	0.000	0.418	3.23 (2,211)	.04	0.020
Total time spent online per log-in
	Linear	0.010	0.004	0.183	7.33 (1,212)	.007	0.029
	Logarithmic	0.146	0.064	0.155	5.21 (1,212)	.02	0.019
	Quadratic	0.001	0.011	0.022	4.04 (2,211)	.02	0.028
Combined activities-modules metric
	Linear	0.007	0.005	0.106	1.22 (1,212)	.12	0.007
	Logarithmic	0.084	0.055	0.104	1.15 (1,212)	.28	0.001
	Quadratic	0.011	0.019	0.169	1.23 (1,211)	.30	0.002