An Empirical Study on the Impact of Duplicate Code

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Executive Summary

In this paper, the authors define a new indicator "Modification frequency" to measure the impact of duplicate code and compare the values between duplicate code and non-duplicate code. The features of this paper are as follows: the indicator used in this paper is based on modification places instead of the ratio of modified lines; they use multiple duplicate code detection tools to reduce biases of detection tools; and they compare the result of the proposed method with other two investigation methods. The result shows that duplicate code tends to be less frequently modified than non-duplicate code, and they found some instances that the proposed method can evaluate the influence of duplicate code more accurately than the existing investigation methods.

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