The effect of log transformation in multivariate liner regression models for software effort prediction

Akito Monden, Kenichi Kobayashi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Multivariate linear regression models have been commonly used as software efort prediction models. To improve the prediction accuracy, it is a common practice to transform (especially, log-transform) the data before building a model, although its theoretical basis is not necessarily clear. This paper reveals that the log-transformed linear regression model (log-log regression model) is equal to the exponential model, which is suitable to characterize various relationships among software related metrics. However, when using a log-log regression model, the result of inverse transformation tends to under-estimate the efort. This paper also introduces a method to correct such bias.

Original languageEnglish
Pages (from-to)234-239
Number of pages6
JournalComputer Software
Volume27
Issue number4
Publication statusPublished - Dec 1 2010
Externally publishedYes

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ASJC Scopus subject areas

  • Software

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