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More on Multivariate Gaussians

More on Multivariate GaussiansChuong B. DoNovember 21, 2008Up to this point in class, you have seen Multivariate Gaussians arisein a number of appli-cations, such as the probabilistic interpretation of linear regression, gaussian discriminantanalysis, mixture of Gaussians clustering, and most recently, factor analysis. In these lec-ture notes, we attempt to demystify some of the fancier properties of Multivariate Gaussiansthat were introduced in the recent factor analysis lecture. The goal of these notes is to giveyou some intuition into where these properties come from, so that you can use them withconfidence on your homework (hint hint!)

– The conditional of a joint Gaussian distribution is Gaussian. At first glance, some of these facts, in particular facts #1 and #2, may seem either intuitively obvious or at least plausible. What is probably not so clear, however, is why these facts are so powerful. In this document, we’ll provide some intuition for how these facts

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