RQ4: Is TestI a better code change predictor than TextI?

TestI has better recall but inferior precision than TextI

Wilcoxon Signed-Rank test applied to precision and recall measures of ITest and IText

Hypothesis pvalue r TestI-NF precision = TextI-NF precision 2.7e-37 0.59 TestI-NF recall = TextI-NF recall 3.4e-04 0.17 TestI-CF precision = TextI-CF precision 5.2e-15 0.36 TestI-CF recall = TextI-CF recall 1.2e-06 0.23