Articles by Joel Cadwell

Matrix Factorization Comes in Many Flavors: Components, Clusters, Building Blocks and Ideals

August 6, 2015 | Joel Cadwell

Unsupervised learning is covered in Chapter 14 of The Elements of Statistical Learning. Here we learn about several data reduction techniques including principal component analysis (PCA), K-means clustering, nonnegative matrix factorization (NMF) and archetypal analysis (AA). Although on the surface they seem so different, each is a data approximation technique using ... [Read more...]

But I Don’t Want to Be a Statistician!

July 29, 2015 | Joel Cadwell

"For a long time I have thought I was a statistician.... But as I have watched mathematical statistics evolve, I have had cause to wonder and to doubt.... All in all, I have come to feel that my central interest is in data analysis...."Opening paragrap... [Read more...]

But I Don’t Want to Be a Statistician!

July 29, 2015 | Joel Cadwell

"For a long time I have thought I was a statistician.... But as I have watched mathematical statistics evolve, I have had cause to wonder and to doubt.... All in all, I have come to feel that my central interest is in data analysis...."Opening paragraph from John Tukey "The ... [Read more...]

"Models, Models Everywhere!" Brought to You by R

July 21, 2015 | Joel Cadwell

Statistical software packages sell solutions. If you go to the home page for SAS, they will tell you upfront that they sell products and solutions. They link both together under the first tab just below "The Power to Know" mantra. SPSS separates product and solution into separate tabs, but places ... [Read more...]
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