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Table 2 Data preprocessing

From: A genetic algorithm based framework for software effort prediction

PP Description
None(None) This data preprocessing presents the data unchanged.
Logarithmic(Log) In this data preprocessing, all the numeric values are replaced by their logarithmic values.
Box-Cox(BC) Is a parametric power transformation technique in order to reduce anomalies such as non-normality and heteroscedasticity. This data preprocessing was introduced by Tukey (1957) as a family of power transformations such that the transformed values are a monotonic function of the observations over admissible range. (Sakia 1992)