Horn’s method: A simulation-based method for retaining principal components

December 9, 2020
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Horn’s method: A simulation-based method for retaining principal components

One purpose of principal component analysis (PCA) is to reduce the number of important variables in a data analysis. Thus, PCA is known as a dimension-reduction algorithm. I have written about four simple rules for deciding how many principal components (PCs) to keep. There are other methods for deciding how

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Understanding the SAS Hot Fix Analysis, Download and Deployment Tool Report

December 8, 2020
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Understanding the SAS Hot Fix Analysis, Download and Deployment Tool Report

Passionate about helping SAS customers, Sandy Gibbs of Technical Support sheds light on the SASHFADD tool report. This is the second of three posts on our hot-fix process.

Understanding the SAS Hot Fix Analysis, Download and Deployment Tool Report was published on SAS Users.


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Append and Replace Records in a CAS Table

December 7, 2020
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Append and Replace Records in a CAS Table

In my previous blog post, I talked about using PROC CAS to accomplish various data preparation tasks. Since then, my colleague Todd Braswell and I worked through some interesting challenges implementing an Extract, Transform, Load (ETL) process that continuously updates data in CAS. (Todd is really the brains behind getting

Append and...
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Can you transplant an indoor Christmas tree?

December 7, 2020
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Can you transplant an indoor Christmas tree?

"O Christmas tree, O Christmas tree, how lovely are your branches!" The idealized image of a Christmas tree is a perfectly straight conical tree with lush branches and no bare spots. Although this ideal exists only on Christmas cards, forest researchers are always trying to develop trees that approach the

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How to score a logistic regression model that was not fit by PROC LOGISTIC

December 2, 2020
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How to score a logistic regression model that was not fit by PROC LOGISTIC

A SAS customer asked a great question: "I have parameter estimates for a logistic regression model that I computed by using multiple imputations. How do I use these parameter estimates to score new observations and to visualize the model? PROC LOGISTIC can do the computation I want, but how do

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Intransitive dice

November 30, 2020
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Intransitive dice

Most games of skill are transitive. If Player A wins against Player B and Player B wins against Player C, then you expect Player A to win against Player C, should they play. Because of this, you can rank the players: A > B > C Interestingly, not all games

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The SAS Hot Fix Analysis, Download and Deployment (SASHFADD) Tool

November 24, 2020
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The SAS Hot Fix Analysis, Download and Deployment (SASHFADD) Tool

SAS' Sandy Gibbs kicks off a series of posts on hot fixes for SAS®9 environments.

The SAS Hot Fix Analysis, Download and Deployment (SASHFADD) Tool was published on SAS Users.


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Ignore This Blog Post

November 24, 2020
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Ignore This Blog Post

The Little SAS Book, Sixth Edition is now a year old.  I have already written posts about What’s New in this edition, and the very cool XLSX LIBNAME engine.  So what more is there to say?  A lot, it turns out.  The Sixth Edition was our biggest rewrite since the Second Edition introduced the...
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Decile plots in SAS

November 23, 2020
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Decile plots in SAS

I previously showed how to create a decile calibration plot for a logistic regression model in SAS. A decile calibration plot (or "decile plot," for short) is used in some fields to visualize agreement between the data and a regression model. It can be used to diagnose an incorrectly specified

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