Art of Stat: Regression is an iPhone application designed for statistical analysis, focusing on linear regression. The app offers features such as creating scatterplots, fitting simple linear, logistic, or exponential regression models, and conducting inference for model parameters. It also computes confidence intervals for the mean response and prediction intervals for future responses. The app visualizes the fitted model and intervals on the scatterplot and allows users to plot raw and standardized residuals. Additionally, users can color points on the scatterplot based on a third variable to uncover further patterns.

The latest updates include the ability to enter data through the Data Editor app, import CSV files, or use pre-loaded example datasets. Users can now fit multiple linear regression models with quantitative and categorical predictors, analyze pairwise relationships with a Scatterplot Matrix, view regression equations and coefficients, obtain summary statistics like R^2-adjusted, download fitted values and residuals, make predictions, and assess assumptions and outliers with residual plots.