Singular parameterizations, generalized inverses, and regression estimates

November 28, 2018
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Singular parameterizations, generalized inverses, and regression estimates

I remember the first time I used PROC GLM in SAS to include a classification effect in a regression model. I thought I had done something wrong because the parameter estimates table was followed by a scary-looking note: Note: The X'X matrix has been found to be singular, and a

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Recent climate assessment report – why “I don’t believe it” either

November 27, 2018
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The US recently released the National Climate Assessment. When asked about it, Trump said he had only read "some" of the report, and he told reporters "I don't believe it." Climate change and global warming is a hotly debated topic, but putting aside the debate itself, I also read "some"

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Creating a ‘Matrix-like’ movie scroll animation, from a text file

November 26, 2018
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Do you remember The Matrix movies, that started coming out in 1999? Hopefully this movie franchise didn't give you a fear of virtual reality and AI. The thing I remember most from the movie was the really cool slow-motion video effects (from multiple angles) in the fight scenes. And the

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Digital Disruption in Healthcare

November 26, 2018
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Joseph Woodside discusses the evolution of digital transformation in healthcare in three eras. The post Digital Disruption in Healthcare appeared first on SAS Learning Post.
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A funnel plot for immunization rates

November 26, 2018
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A funnel plot for immunization rates

Last week my colleague, Robert Allison, visualized data regarding immunization rates for kindergarten classes in North Carolina. One of his graphs was a scatter plot that displayed the proportion of unimmunized students versus the size of the class for 1,885 kindergarten classes in NC. This scatter plot is the basis

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Visualize your own image fitler

November 23, 2018
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Visualize your own image fitler

First load necessary packages import pandas as pdimport numpy as npfrom keras.models import Sequentialfrom keras.layers import Dense, Dropout, Conv2Dimport keras.backend as Kimport scipy, imageioimport matplotlib.pyplot as pltfrom PIL import Image%matp...
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Finding a cut-your-own Christmas tree in North Carolina

November 21, 2018
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This week I noticed that they've started building the lot where they sell Christmas trees near SAS (at the intersection of Maynard & Reedy Creek Rd). They put up a nice rustic wooden fence, and lights, and maybe even a fire pit to keep their worker...
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Generalized inverses for matrices

November 21, 2018
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A data analyst asked how to compute parameter estimates in a linear regression model when the underlying data matrix is rank deficient. This situation can occur if one of the variables in the regression is a linear combination of other variables. It also occurs when you use the GLM parameterization

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Immunization rates in North Carolina schools

November 20, 2018
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I recently read an article that said a school in Asheville, North Carolina had the worst chickenpox outbreak in the state in 2 decades. The article was interesting, and it also let me know I had a hole in my knowledge ... "What?!? - There's a chickenpo...
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