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) |