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- W2894923858 abstract "Context: Identifying defects in code early is important. A wide range of static code metrics have been evaluated as potential defect indicators. Most of these metrics offer only high level insights and focus on particular pre-selected features of the code. None of the currently used metrics clearly performs best in defect prediction. Objective: We use Abstract Syntax Tree (AST) n-grams to identify features of defective Java code that improve defect prediction performance. Method: Our approach is bottom-up and does not rely on pre-selecting any specific features of code. We use non-parametric testing to determine relationships between AST n-grams and faults in both open source and commercial systems. We build defect prediction models using three machine learning techniques. Results: We show that AST n-grams are very significantly related to faults in some systems, with very large effect sizes. The occurrence of some frequently occurring AST n-grams in a method can mean that the method is up to three times more likely to contain a fault. AST n-grams can have a large effect on the performance of defect prediction models. Conclusions: We suggest that AST n-grams offer developers a promising approach to identifying potentially defective code." @default.
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- W2894923858 date "2019-02-01" @default.
- W2894923858 modified "2023-10-16" @default.
- W2894923858 title "Automatically identifying code features for software defect prediction: Using AST N-grams" @default.
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- W2894923858 doi "https://doi.org/10.1016/j.infsof.2018.10.001" @default.
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