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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