I work a lot with Pivot Tables in Microsoft Excel. A problem I often encounter is trying to analyze a spreadsheet in which data from a single variable has been spread out over many columns. In particular, this happens rather frequently with longitudinal data. If you are trying to look ...

As part of my tutorial talk on RStanARM, I presented some examples of how to visualize the uncertainty in Bayesian linear regression models. This post is an expanded demonstration of the approaches I presented in that tutorial. Data: Does brain mass predict how much mammals sleep in a day? Let’...

The term ‘discriminant analysis’ is often used interchangeably to represent two different objectives. These objectives of discriminant analysis are: Description of group separation. Linear combinations of variables, known as discriminant functions, of the dependent variables that maximize the separation between the groups are used to identify the relative contribution of... ...

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The fourth, the fifth, the minor fall and the major lift (Hallelujah, Leonard Cohen) Next problem is extracted from MacKay’s Information Theory, Inference and Learning Algorithms: Two people have left traces of their own blood at the scene of a crime. A suspect, Oliver, is tested and found to ...