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Data Visualization
Sanjay Matange 0
Density Strip Plot

In the previous post on Violin Plots, we discussed the process to create custom density plots.  This work was done in collaboration with SAS user James Marcus.  This is the second installment on the same topic - Creating Density Strip Plots.  We will use the same data and process to compute

Advanced Analytics
Rick Wicklin 0
Compute the log-determinant of a matrix

The determinant of a matrix arises in many statistical computations, such as in estimating parameters that fit a distribution to multivariate data. For example, if you are using a log-likelihood function to fit a multivariate normal distribution, the formula for the log-likelihood involves the expression log(det(Σ)), where Σ is the

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