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Data Visualization

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Rick WicklinFebruary 7, 2018 0

The distribution of shared birthdays in the Birthday Problem

If N random people are in a room, the classical birthday problem provides the probability that at least two people share a birthday. The birthday problem does not consider how many birthdays are in common. However, a generalization (sometimes called the Multiple-Birthday Problem) examines the distribution of the number of

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Data Visualization

A stacked band plot, created in SAS by using PROC SGPLOT

Rick WicklinJanuary 31, 2018 10

Create a stacked band plot in SAS

This article shows how to construct a "stacked band plot" in SAS, as shown to the right. (Click to enlarge.) You are probably familiar with a stacked bar chart in which the cumulative amount of some quantity is displayed by stacking the contributions of several groups. A canonical example is

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Data Visualization

Cost of vaginal delivery and C-section for US states (2015-2016)

Rick WicklinJanuary 17, 2018 1

How much does it cost to give birth in the US?

Money magazine (Jan/Feb 2018) contains an article about how much it costs to give birth in the US. The costs, which are based on insurance data, include prenatal care and hospital delivery but exclude infant care. The data are compiled for each state (including Washington, DC) and by type of

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Data Visualization | Learn SAS | Programming Tips

Rick WicklinJanuary 8, 2018 3

Label multiple regression lines in SAS

A SAS programmer asked how to label multiple regression lines that are overlaid on a single scatter plot. Specifically, he asked to label the curves that are produced by using the REG statement with the GROUP= option in PROC SGPLOT. He wanted the labels to be the slope and intercept

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Analytics | Data Visualization | Learn SAS

Rick WicklinDecember 20, 2017 4

How to create a sliced fit plot in SAS

I previously showed an easy way to visualize a regression model that has several continuous explanatory variables: use the SLICEFIT option in the EFFECTPLOT statement in SAS to create a sliced fit plot. The EFFECTPLOT statement is directly supported by the syntax of the GENMOD, LOGISTIC, and ORTHOREG procedures in

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Analytics | Data Visualization | Learn SAS

Visualize multivariate regression model by slicing the continuous variables. Graph created by using the EFFECTPLOT SLICEFIT statement in SAS.

Rick WicklinDecember 18, 2017 5

Visualize multivariate regression models by slicing continuous variables

Slice, slice, baby! You've got to slice, slice, baby! When you fit a regression model that has multiple explanatory variables, it is a challenge to effectively visualize the predicted values. This article describes how to visualize the regression model by slicing the explanatory variables. In SAS, you can use the

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Data Visualization | Learn SAS

Self-similar Christmas tree created in SAS

Rick WicklinDecember 11, 2017 3

A self-similar Christmas tree

Happy holidays to all my readers! My greeting-card to you is an image of a self-similar Christmas tree. The image (click to enlarge) was created in SAS by using two features that I blog about regularly: matrix computations and ODS statistical graphics. Self-similarity in Kronecker products I have previously shown

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Data Visualization | Programming Tips

Rick WicklinNovember 29, 2017 1

Visualize patterns of missing values

Missing values present challenges for the statistical analyst and data scientist. Many modeling techniques (such as regression) exclude observations that contain missing values, which can reduce the sample size and reduce the power of a statistical analysis. Before you try to deal with missing values in an analysis (for example,

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Data Visualization | Programming Tips

Rick WicklinOctober 30, 2017 1

A SAS programming technique to modify ODS templates

This article demonstrates a SAS programming technique that I call Kuhfeld's template modification technique. The technique enables you to dynamically modify an ODS template and immediately call the modified template to produce a new graph or table. By following the five steps in this article, you can implement the technique

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Analytics | Data Visualization | Learn SAS

Lines plot for multiple comparison of means in SAS

Rick WicklinOctober 16, 2017 13

Graphs for multiple comparisons of means: The lines plot

Last week Warren Kuhfeld wrote about a graph called the "lines plot" that is produced by SAS/STAT procedures in SAS 9.4M5. (Notice that the "lines plot" has an 's'; it is not a line plot!) The lines plot is produced as part of an analysis that performs multiple comparisons of

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