Changes in free and open source software licenses: managerial interventions and variations on project attractiveness

Journal of Internet Services and Applications

Table 6 Statistical tests for attractiveness mean differences

		Paired differences of attractiveness					t	df	p-value	Cohen’s D
					99% confidence interval
one MINUS another licensing schema		Mean	Std. Deviation	Std. Error Mean	Lower	Upper
Pair 1	A – B	0.22	3.97	0.10	−0.02	0.47	2.33	1735	0.02	0.06
Pair 2	A - C*^a	0.90	3.87	0.27	0.19	1.61	3.28	200	0.00	0.23
Pair 3	A – D	0.04	3.74	0.09	−0.19	0.27	0.50	1751	0.62	0.01
Pair 4	A – E	−0.31	4.08	0.14	−0.66	0.04	−2.26	895	0.02	−0.08
Pair 5	A – F	0.03	3.91	0.09	−0.21	0.27	0.34	1749	0.74	0.01
Pair 6	A - G*	−0.67	4.22	0.11	−0.95	−0.39	−6.24	1553	0.00	−0.16
Pair 7	B – C	0.39	3.44	0.25	−0.24	1.03	1.61	195	0.11	0.11
Pair 8	B - D*	−0.38	3.57	0.05	−0.51	−0.24	−6.95	4356	0.00	−0.11
Pair 9	B - E*	−0.57	3.84	0.13	−0.91	−0.22	−4.26	829	0.00	−0.15
Pair 10	B - F*	−0.32	3.95	0.06	−0.48	−0.17	−5.44	4419	0.00	−0.08
Pair 11	B - G*^a	−0.90	4.19	0.11	−1.18	−0.62	−8.22	1458	0.00	−0.22
Pair 12	C – D	−0.06	3.44	0.25	−0.72	0.59	−0.26	186	0.80	−0.02
Pair 13	C - E*^a	−0.90	3.60	0.24	−1.53	−0.28	−3.77	224	0.00	−0.25
Pair 14	C – F	0.09	3.23	0.23	−0.50	0.69	0.40	197	0.69	0.03
Pair 15	C - G*^a	−1.35	3.79	0.25	−2.01	−0.68	−5.28	220	0.00	−0.36
Pair 16	D - E*	−0.60	3.67	0.13	−0.93	−0.27	−4.70	817	0.00	−0.16
Pair 17	D – F	0.07	3.66	0.05	−0.07	0.21	1.28	4614	0.20	0.02
Pair 18	D - G*^a	−0.84	3.95	0.10	−1.10	−0.57	−8.17	1490	0.00	−0.21
Pair 19	E - F*	0.65	3.85	0.13	0.31	0.99	4.88	836	0.00	0.17
Pair 20	E – G	−0.31	4.07	0.13	−0.65	0.04	−2.29	927	0.02	−0.08
Pair 21	F - G*	−0.77	4.16	0.11	−1.05	−0.50	−7.20	1504	0.00	−0.19

*indicates significance at 0,05 with Bonferroni correction (<0,0023 = 0,05/21)
Cohen’s D calculated as mean divided by std. deviation. Superscript letter A means effect size between small and medium
Source: Authors own