Normal distribution test (Shapiro-Wilk) over all features IFD: 2.723601e-32 IFD_W: 1.964035e-32 EFD: 7.005095e-26 EFD_W: 6.9681e-26 NAR: 2.163348e-31 NMR: 4.225856e-29 Normal distribution test (Shapiro-Wilk) over means of product lines IFD: 0.0001919760 IFD_W: 0.0002778017 EFD: 0.3418812 EFD_W: 0.4457035 NAR: 0.00192317 NMR: 0.1966020 Pearson's coefficient (measure vs. measure): IFD ~ IFD_W: 1 p-value: 0 IFD ~ EFD: 0.27 p-value: 1.303246e-11 IFD ~ EFD_W: 0.28 p-value: 5.349499e-12 IFD ~ NAR: 0.46 p-value: 0 IFD ~ NMR: 0.51 p-value: 0 IFD_W ~ EFD: 0.27 p-value: 2.030953e-11 IFD_W ~ EFD_W: 0.28 p-value: 5.053069e-12 IFD_W ~ NAR: 0.47 p-value: 0 IFD_W ~ NMR: 0.51 p-value: 0 EFD ~ EFD_W: 0.99 p-value: 0 EFD ~ NAR: -0.15 p-value: 0.0003011454 EFD ~ NMR: -0.08 p-value: 0.03959449 EFD_W ~ NAR: -0.11 p-value: 0.005992006 EFD_W ~ NMR: -0.07 p-value: 0.1017917 NAR ~ NMR: 0.87 p-value: 0 Pearson's coefficient (size vs. measure): IFD ~ LOC: 0.15 p-value: 0.3397577 IFD ~ FEAT_NUM: 0.55 p-value: 0.000227995 IFD ~ FEAT_LOC: -0.2 p-value: 1.268674e-06 IFD_W ~ LOC: 0.16 p-value: 0.3144938 IFD_W ~ FEAT_NUM: 0.56 p-value: 0.0001960345 IFD_W ~ FEAT_LOC: -0.2 p-value: 1.667975e-06 EFD ~ LOC: -0.44 p-value: 0.004053622 EFD ~ FEAT_NUM: 0.07 p-value: 0.6702864 EFD ~ FEAT_LOC: 0.05 p-value: 0.1993287 EFD_W ~ LOC: -0.43 p-value: 0.005125696 EFD_W ~ FEAT_NUM: 0.08 p-value: 0.6231256 EFD_W ~ FEAT_LOC: 0.05 p-value: 0.1993287 NAR ~ LOC: 0.14 p-value: 0.3855205 NAR ~ FEAT_NUM: 0.36 p-value: 0.02311207 NAR ~ FEAT_LOC: -0.34 p-value: 2.379520e-17 NMR ~ LOC: 0.07 p-value: 0.6673483 NMR ~ FEAT_NUM: 0.36 p-value: 0.02331932 NMR ~ FEAT_LOC: -0.3 p-value: 2.655732e-13 Mann-Whitney-U-Test (process vs. measure) IFD ~ PROC: 2.850727e-12 scratch (mean): 23.57840 refactored (mean): 45.37086 IFD_W ~ PROC: 3.970054e-12 scratch (mean): 23.26969 refactored (mean): 45.10132 EFD ~ PROC: 4.830907e-10 scratch (mean): 58.08711 refactored (mean): 75.34106 EFD_W ~ PROC: 1.176024e-09 scratch (mean): 57.66481 refactored (mean): 74.98543 NAR ~ PROC: 0.006022874 scratch (mean): 89.97596 refactored (mean): 92.80066 NMR ~ PROC: 0.00333064 scratch (mean): 83.49512 refactored (mean): 87.44603 Kruskal-Wallis-Test for all samples: IFD ~ PROG 3.649267e-14 IFD_W ~ PROG 6.136788e-14 EFD ~ PROG 6.68053e-13 EFD_W ~ PROG 9.553646e-12 NAR ~ PROG 8.239326e-10 NMR ~ PROG 8.837335e-10 Kruskal-Wallis-Test for AHEAD: IFD ~ PROG 0.994003 IFD_w ~ PROG 0.9910433 EFD ~ PROG 0.2554269 EFD_W ~ PROG 0.2615625 NAR ~ PROG 0.5565145 NMR ~ PROG 0.4565421 ~ p-value 0.59 Kruskal-Wallis-Test for Bali: IFD ~ PROG 0.9632634 IFD_W ~ PROG 0.9781421 EFD ~ PROG 0.9601047 EFD_W ~ PROG 0.9589876 NAR ~ PROG 0.9421947 NMR ~ PROG 0.9841833 ~ p-value 0.96 Kruskal-Wallis-Test for Notepad: IFD ~ PROG 0.1414545 IFD_W ~ PROG 0.2036637 EFD ~ PROG 0.09598478 EFD_W ~ PROG 0.09909592 NAR ~ PROG 0.7941892 NMR ~ PROG 0.71688 ~ p-value 0.34 Kruskal-Wallis-Test for ChatSystem: IFD ~ PROG 0.378386 IFD_W ~ PROG 0.2090394 EFD ~ PROG 0.2590800 EFD_W~PROG 0.2817865 NAR ~ PROG 0.02173628 NMR ~ PROG 0.03554175 ~ p-value 0.2