The regression models of software project duration based on project effort are considered. The aim of the research is to derive equations of confidence interval of a non-linear regression model of software project duration based on Johnson transformation for the personal computer (PC) development platform. Non-linear regression models of software project duration based on project effort are widely used. However, existing models do not provide equations to estimate the confidence interval of non-linear regression. Therefore, it is required to build a confidence interval of non-linear regression. In this paper, equations of a confidence interval of a non-linear regression model of software project duration based on Johnson transformation from the SB family are derived for the PC development platform. Mathematical statistics, regression and interval analysis methods are used to analyze data samples and derive equations of a confidence interval of a non-linear regression model.

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