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***New release in 2018***   RegressIt is a free Excel add-in for linear and logistic regression and multivariate data analysis with a richly detailed user interface and better quality output than commercial add-ins.   The new linear version runs on both PC's and Macs, and a version that also includes logistic regression with highly interactive output runs on PC's.  It now includes extensive teaching notes that be embedded in Excel output as pop-up cell comments.  All the versions include a 2-way interface for exchanging models with R.  You can use RegressIt as a menu-driven front end for running linear and logistic regression models in R (with no knowledge of R programming required), and you can use RegressIt to instantly re-run models fitted in R in order to get more detailed and better quality output in Excel format.  RegressIt offers presentation-quality graphics and support for good analytical practices, especially data and model visualization, tests of model assumptions, appropriate use of transformed variables in linear models,  intelligent formatting of tables and charts, keeping a detailed and well-organized audit trail, and uniquely identifying the user who performed the analysis. It provides a good complement, if not a substitute, for commercial statistical software as far as linear regression modeling and descriptive analysis are concerned.  It was developed in a university teaching environment but is also intended for professional use.

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