RegressIt: Free Excel Add-in for Linear Regression & Multivariate Data AnalysisRegress-It is a powerful Excel add-in which performs multivariate descriptive data analysis and linear regression analysis with high-quality table and chart output in native Excel format. The 2019 version, which runs on both Macs and PC's, is now available on this site. There is also a separate logistic regression version for the PC, with highly interactive table and chart output that is great for demonstrations. The new versions of RegressIt feature a 40-button ribbon interface (pictured below) which provides innovative model space and worksheet navigation tools, built-in documentation and teaching notes, interactive use of cell colors and fonts, a multi-threaded audit trail, and the ability to exchange regression code with R. The ribbon greatly streamlines the analysis, minimizing the number of mouse clicks or finger taps that are needed for careful well-labeled work, and it makes it largely unnecessary to use any of Excel's own buttons or menu