Data Awesome https://data-awesome.com/blog Writing on data analytics, Alteryx, AI and the career around them, from ten years leading analytics in airline operations. en-us racine.isacar@gmail.com (Isacar Racine) racine.isacar@gmail.com (Isacar Racine) Mon, 06 Apr 2026 00:00:00 GMT https://data-awesome.com/blog/variable-selection-regularization Variable Selection, Ridge, Lasso, Elastic Net https://data-awesome.com/blog/variable-selection-regularization Ridge, lasso and elastic net returned identical test error, to the last digit. The reason is a mistake hiding in a workflow you have copied. Mon, 06 Apr 2026 00:00:00 GMT racine.isacar@gmail.com (Isacar Racine) regressionmachine-learningstatisticsr https://data-awesome.com/blog/logistic-regression-reading-output How to Read Logistic Regression Output https://data-awesome.com/blog/logistic-regression-reading-output Your model says 1.60. That cannot be a probability. Four things that go wrong reading logistic output, and none of them throw an error. Mon, 30 Mar 2026 00:00:00 GMT racine.isacar@gmail.com (Isacar Racine) regressionstatisticsr https://data-awesome.com/blog/regression-diagnostics-outliers-multicollinearity The R-Squared Trap: When Cleaning Backfires https://data-awesome.com/blog/regression-diagnostics-outliers-multicollinearity I removed 53 outliers. R-squared rose from 0.818 to 0.856 and the model got worse. Every number that improved ignored the rows I deleted. Mon, 23 Mar 2026 00:00:00 GMT racine.isacar@gmail.com (Isacar Racine) regressionmodel-diagnosticsstatisticsr https://data-awesome.com/blog/multiple-regression-interpreting-coefficients How to Read a Regression Coefficient https://data-awesome.com/blog/multiple-regression-interpreting-coefficients Your slide says $368. A colleague who ran the same data says $422. Four ways a regression coefficient means less than it appears to. Mon, 16 Mar 2026 00:00:00 GMT racine.isacar@gmail.com (Isacar Racine) regressionstatisticsr