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Table 9 The indicators have been analyzed and whose conclusions are inconsistent. “\(A \xrightarrow {\; +\;}B\)” means A makes a positive impact on B, “\(A \xrightarrow {\; -\;}~B\)” indicates A has negative influence on B, and “\(A \xrightarrow {\; 0\;}~B\)” presents A and B are independent. θ is the threshold for correlation. Generally, a value larger than |θ| indicates a considerable positive or negative effect between two variables

From: Evaluation indicators for open-source software: a review

Paper Conclusion Correlation Val.
Stewart et al. (2006) User interest \(\xrightarrow {\;+\;}\)Project activity 14.854
Subramaniam et al. (2009) User interest \(\xrightarrow {\;-\;}\)Project activity -0.081 (|θ|=0.0003)
Subramaniam et al. (2009) Unix-like operating system \(\xrightarrow {\;+\;}\) Project activity 0.134 (|θ|=0.029)
Beecher et al. (2008) Unix-like operating system \(\xrightarrow {\;-\;}\) Project activity N.A.
Lerner and Tirole (2005) License \(\xrightarrow {\;0\;}\) Project status N.A.
Comino et al. (2007) License \(\xrightarrow {\;-\;}\)Project status -0.1156
Wu et al. (2007) Programming language \(\xrightarrow {\;0\;}\)Popularity N.A.
Ghapanchi and Tavana (2015) Programming language \(\xrightarrow {\;+\;}\)Popularity 0.039 0.094
  1. 1The two or three correlation values indicate the authors make experiments for two or three times in different periods