Publications by dmwiig
R for Beginners: Some Simple Code to Produce Informative Graphs, Part One
A Tutorial by D. M. Wiig The R programming language has a multitude of packages that can be used to display various types of graph. For a new user looking to display data in a meaningful way graphing functions can look very intimidating. When using a statistics package such as SPSS, Stata, Minitab or even some of the R Gui’s such R Commander so...
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R For Beginners: Basic Graphics Code to Produce Informative Graphs, Part Two, Working With Big Data
R for beginners: Some basic graphics code to produce informative graphs, part two, working with big data A tutorial by D. M. Wiig In part one of this tutorial I discussed the use of R code to produce 3d scatterplots. This is a useful way to produce visual results of multi- variate linear regression models. While visual displays using scatterplots...
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R Tutorial: Visualizing Multivariate Relationships in Large Datasets
R Tutorial: Visualizing multivariate relationships in Large Datasets A tutorial by D.M. Wiig In two previous blog posts I discussed some techniques for visualizing relationships involving two or three variables and a large number of cases. In this tutorial I will extend that discussion to show some techniques that can be used on large datasets an...
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The R qgraph Package: Using R to Visualize Complex Relationships Among Variables in a Large Dataset, Part One
The R qgraph Package: Using R to Visualize Complex Relationships Among Variables in a Large Dataset, Part One A Tutorial by D. M. Wiig, Professor of Political Science, Grand View University In my most recent tutorials I have discussed the use of the tabplot() package to visualize multivariate mixed data types in large datasets. This type of table...
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An R Tutorial: Visual Representation of Complex Multivariate Relationships Using the R qgraph Package, Part Two Repost
This is a repost of the original article that was posted as an embedded PDF file. Douglas M. Wiig April 8, 2018 Abstract This article is part of my series of articles exploring the use of R packages that allow for visualization of complex relationships among variables. Other articles have examined visual representations produced by the qgraph p...
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Visual Representation of Text Data Sets using the R tm and wordcloud packages: part one, Beginner’s Guide
Visual Representation of Text Data Sets Using the R tm and wordcloud Packages: Part One Douglas M. Wiig This paper is the next installment in series that examines the use of R scripts to present and analyze complex data sets using various types of visual representations. Previous papers have discussed data sets containing a small number of case...
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