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Table 6 Statistical tests for attractiveness mean differences

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

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