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There are several different functions and methods available in R to
compute statistics or, more generally, apply functions to groups of
observations within a data set. The tapply() function is…
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We continue to discuss data structures in R, this time focusing on arrays. An array is a generalization of a matrix with an arbitrary number of dimensions. We illustrate the structure with a three…
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In this video I review the basic ideas of the one-way ANOVA, with emphasis on the model, including both common parameterizations of it: the effects version and the cell-means version. You should have…
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In SAS, arrays provide a convenient way to refer to other variables via an index-able alias. This is convenient when you want to do the same operation on multiple variables in a data set. Having an…
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This video provides a historical overview of the conflict between Israel and its neighbors.
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