The sample skewness is a biased statistic

October 28, 2020
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The sample skewness is a biased statistic

The skewness of a distribution indicates whether a distribution is symmetric or not. The Wikipedia article about skewness discusses two common definitions for the sample skewness, including the definition used by SAS. In the middle of the article, you will discover the following sentence: In general, the are both biased

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Confidence intervals for eigenvalues of a correlation matrix

October 26, 2020
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Confidence intervals for eigenvalues of a correlation matrix

A fundamental principle of data analysis is that a statistic is an estimate of a parameter for the population. A statistic is calculated from a random sample. This leads to uncertainty in the estimate: a different random sample would have produced a different statistic....
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Generate random points in a polygon

October 21, 2020
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Generate random points in a polygon

The triangulation theorem for polygons says that every simple polygon can be triangulated. In fact, if the polygon has V vertices, you can decompose it into V-2 non-overlapping triangles. In this article, a "polygon" always means a simple polygon. Also, a "random point" means...
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Debugging SASUSER issues when you use SAS® software

October 19, 2020
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Debugging SASUSER issues when you use SAS® software

When you use SAS software, you might occasionally encounter an issue with SASUSER. This post helps you debug some of the more common issues: a warning message indicates that SASUSER.TEMPLAT is not an item store or that you cannot write to SASUSER.TEMPLAT a note...
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Generate random points in a triangle

October 19, 2020
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Generate random points in a triangle

How can you efficiently generate N random uniform points in a triangular region of the plane? There is a very cool algorithm (which I call the reflection method) that makes the process easy. I no longer remember where I saw this algorithm, but it...
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Using Microsoft Excel functions in SAS

October 15, 2020
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Using Microsoft Excel functions in SAS

SAS' Leonid Batkhan summarizes a lesser known but useful feature in SAS that allows you to bring Microsoft Excel functions into your SAS programs.

Using Microsoft Excel functions in SAS was published on SAS Users.


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A continuous band plot for visualizing uncertainty in regression predictions

October 14, 2020
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A continuous band plot for visualizing uncertainty in regression predictions

A previous article discusses the confidence band for the mean predicted value in a regression model. The article shows a "graded confidence band plot," which I saw in Claus O. Wilke's online book, Fundamentals of Data Visualization (Section 16.3). It communicates uncertainty in the...
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Visualize uncertainty in regression predictions

October 12, 2020
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Visualize uncertainty in regression predictions

You've probably seen many graphs that are similar to the one at the right. This plot shows a regression line overlaid on a scatter plot of some data. Given a value for the independent variable (x), the regression line gives the best prediction for...
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Metacoda Plug-ins Tip: Replaceable Tokens

October 9, 2020
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This is a tip for those who use the Metacoda Security Plug-ins Batch Interface for scheduled automation of SAS® metadata security reporting, testing and identity synchronization. You will find this tip useful if you are using the same configuratio...
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