Posts Tagged ‘ data analysis ’

No major hurricanes have hit the US coast recently. Lucky us!

May 14, 2015
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No major hurricanes have hit the US coast recently. Lucky us!

Perhaps you saw the headlines earlier this week about the fact that it has been nine years since the last major hurricane (category 3, 4, or 5) hit the US coast. According to a post on the GeoSpace blog, which is published by the American Geophysical Union (AGU), researchers ran

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Create and use a permutation matrix in SAS

April 29, 2015
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Create and use a permutation matrix in SAS

Suppose that you compute the correlation matrix (call it R1) for a set of variables x1, x2, ..., x8. For some reason, you later want to compute the correlation matrix for the variables in a different order, maybe x2, x1, x7,..., x6. Do you need to go back to the

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Finding observations that match a target value

March 18, 2015
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Finding observations that match a target value

Imagine that you have one million rows of numerical data and you want to determine if a particular "target" value occurs. How might you find where the value occurs? For univariate data, this is an easy problem. In the SAS DATA step you can use a WHERE clause or a

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Analyzing the first 10 million digits of pi: Randomness within structure

March 12, 2015
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Analyzing the first 10 million digits of pi: Randomness within structure

Saturday, March 14, 2015, is Pi Day, and this year is a super-special Pi Day! This is your once-in-a-lifetime chance to celebrate the first 10 digits of pi (π) by doing something special on 3/14/15 at 9:26:53. Apologies to my European friends, but Pi Day requires that you represent dates

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Aborting a SAS/IML program upon encountering an error

March 3, 2014
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A colleague sent me an interesting question: What is the best way to abort a SAS/IML program? For example, you might want to abort a program if the data is singular or does not contain a sufficient number of observations or variables. As a first attempt would be to try
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How to automatically select a smooth curve for a scatter plot in SAS

February 26, 2014
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How to automatically select a smooth curve for a scatter plot in SAS

My last blog post described three ways to add a smoothing spline to a scatter plot in SAS. I ended the post with a cautionary note: From a statistical point of view, the smoothing spline is less than ideal because the smoothing parameter must be chosen manually by the user.
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How to specify mosaic plot colors in SAS

November 6, 2013
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How to specify mosaic plot colors in SAS

The mosaic plot is a graphical visualization of a frequency table. In a previous post, I showed how to use the FREQ procedure to create a mosaic plot. This article shows how to create a mosaic plot by using the MOSAICPARM statement in the graph template language (GTL). (The MOSAICPARM
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Create mosaic plots in SAS by using PROC FREQ

November 4, 2013
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Create mosaic plots in SAS by using PROC FREQ

Mosaic plots (Hartigan and Kleiner, 1981; Friendly, 1994, JASA) are used for exploratory data analysis of categorical data. Mosaic plots have been available for decades in SAS products such as JMP, SAS/INSIGHT, and SAS/IML Studio. However, not all SAS customers have access to these specialized products, so I am pleased
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