Posts Tagged ‘ Statistical Graphics ’

Creating heat maps in SAS/IML

August 20, 2014
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Creating heat maps in SAS/IML

In a previous blog post, I showed how to use the graph template language (GTL) in SAS to create heat maps with a continuous color ramp. SAS/IML 13.1 includes the HEATMAPCONT subroutine, which makes it easy to create heat maps with continuous color ramps from SAS/IML matrices. Typical usage includes […]

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Creating a basic heat map in SAS

August 18, 2014
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Creating a basic heat map in SAS

Heat maps have many uses. In a previous article, I showed how to use heat maps with a discrete color ramp to visualize matrices that have a small number of unique values, such as certain covariance matrices and sparse matrices. You can also use heat maps with a continuous color […]

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My courses this fall at Columbia

August 16, 2014
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Stat 6103, Bayesian Data Analysis, TuTh 1-2:30 in room 428 Pupin Hall: We’ll be going through the book, section by section. Follow the link to see slides and lecture notes from when I taught this course a couple years ago. This course has a serious workload: each week we have three homework problems, one theoretical, […] The post My courses this fall at Columbia appeared first on Statistical Modeling, Causal…

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Data & Visualization Tools to Track Ebola

August 10, 2014
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I’ve received the following email (slightly edited for clarity): Can anyone recommend a turnkey, full-service solution to help the Liberian government track the spread of Ebola and get this information out to the public? They want something that lets healthcare workers update info from mobile phones, and a workflow that results in data visualizations. They […] The post Data & Visualization Tools to Track Ebola appeared first on Statistical Modeling,…

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NFL players keep getting bigger and bigger

July 24, 2014
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NFL players keep getting bigger and bigger

Aleks points us to this beautiful dynamic graph by Noah Veltman showing the heights and weights of NFL players over time. The color is pretty but I think I’d prefer something simpler, just one dot per player (with some jittering to handle the discrete reporting of heights and weights). In any case, it’s a great […] The post NFL players keep getting bigger and bigger appeared first on Statistical Modeling,…

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Computing prediction ellipses from a covariance matrix

July 23, 2014
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Computing prediction ellipses from a covariance matrix

In a previous blog post, I showed how to overlay a prediction ellipse on a scatter plot in SAS by using the ELLIPSE statement in PROC SGPLOT. The ELLIPSE statement draws the ellipse by using a standard technique that assumes the sample is bivariate normal. Today's article describes the technique […]

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Add a prediction ellipse to a scatter plot in SAS

July 21, 2014
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Add a prediction ellipse to a scatter plot in SAS

It is common in statistical graphics to overlay a prediction ellipse on a scatter plot. This article describes two easy ways to overlay prediction ellipses on a scatter plot by using SAS software. It also describes how to overlay multiple prediction ellipses for subpopulations. What is a prediction ellipse? A […]

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Stan World Cup update

July 15, 2014
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Stan World Cup update

The other day I fit a simple model to estimate team abilities from World Cup outcomes. I fit the model to the signed square roots of the score differentials, using the square root on the theory that when the game is less close, it becomes more variable. 0. Background As you might recall, the estimated […] The post Stan World Cup update appeared first on Statistical Modeling, Causal Inference, and…

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Stan goes to the World Cup

July 13, 2014
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Stan goes to the World Cup

I thought it would be fun to fit a simple model in Stan to estimate the abilities of the teams in the World Cup, then I could post everything here on the blog, the whole story of the analysis from beginning to end, showing the results of spending a couple hours on a data analysis. […] The post Stan goes to the World Cup appeared first on Statistical Modeling, Causal…

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Create custom tick marks for axes on the log scale

July 11, 2014
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Create custom tick marks for axes on the log scale

In my previous blog post, I showed how to use log axes on a scatter plot in SAS to better visualize data that range over several orders of magnitude. Because the data contained counts (some of which were zero), I used a custom transformation x → log10(x+1) to visualize the […]

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