Blog Archives

Conducting Assessments and Surveys with Shiny

February 23, 2016
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This post describes a framework for using Shiny for conducting, grading, and providing feedback for assessments. This framework supports any multiple choice format including multiple choice tests or Likert type surveys. A demo is available at jbryer.shinyapps.io/ShinyAssessmentTest or can be run locally as a Github Gist: runGist('a6fb5a3b1d5fd56cff64') Key features of this framework include: Assessments take over the entire user interface...

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Shiny App for Bayes Billiards Problem

February 22, 2016
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Consider a pool table of length one. An 8-ball is thrown such that the likelihood of its stopping point is uniform across the entire table (i.e. the table is perfectly level). The location of the 8-ball is recorded, but not known to the observer. Subsequent balls are thrown one at a time and all that is reported is whether...

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Conducting Assessments and Surveys with Shiny

February 21, 2016
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This post describes a framework for using Shiny for conducting, grading, and providing feedback for assessments. This framework supports any multiple choice format including multiple choice tests or Likert type surveys. A demo is available at jbryer.shinyapps.io/ShinyAssessmentTest or can be run locally as a Github Gist: runGist('a6fb5a3b1d5fd56cff64') Key features of this framework include: Assessments take over the entire user interface...

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Shiny App for Bayes Billiards Problem

February 20, 2016
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Shiny App for Bayes Billiards Problem

Consider a pool table of length one. An 8-ball is thrown such that the likelihood of its stopping point is uniform across the entire table (i.e. the table is perfectly level). The location of the 8-ball is recorded, but not known to the observer. Subsequent balls are thrown one at a time and all that is reported is whether...

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Data Caching

July 28, 2014
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Data caching is not new. It is often necessary to save intermediate data files when the process of loading and/or manipulating data takes a considerable amount of time. This problem is further complicated when working with dynamic data that changes regularly. In these situations it often sufficient to use data that is current with in some time frame (e.g....

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Women Graduates in Math, Statistics, and Computer Information Systems

July 3, 2014
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Women Graduates in Math, Statistics, and Computer Information Systems

One of the more interesting talks at this year’s useR! Conference was the heR Panel discussing the role of women in the R community. They estimate that fewer than 15% of package authors are women. One of the points brought up was that this is less than the percentage of women in statistics. Perhaps this is more...

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useR 2014 Slides for PSAboot and Version 1.1 on CRAN

July 3, 2014
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PSAboot is an R package to assist with bootstrapping propensity score methods. I gave a talk today at the useR! 2014 Conference. The slides can be downloaded from the PSAboot Github page or directly here. The package is described at jason.bryer.org/PSA...

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str Implementation for Data Frames

June 5, 2014
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The str function is perhaps the most useful function in R. It provides great information about the structure of some object. When I teach R, especially for those coming from SPSS, the str function for data frames provides the information they are use to seeing on the variable view tab. However, sometimes I want to display the information str...

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Rgitbook Package for Using R Markdown with Gitbook

April 22, 2014
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Last week I published an R script to interface with Gitbook. I received some positive feedback and decided to include all the code in an R package. This also allowed me to make some nice additions including default support for MathJax. It is currently available on Github and can be installed using devtools: devtools::install_github('jbryer/Rgitbook') I have only tested this...

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Using Gitbook with R Markdown

April 18, 2014
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Using Gitbook with R Markdown

Gitbook has been getting some (deserved) attention. For those who haven’t seen it, Gitbook is a system to create really beautiful interactive web (or PDF and ebook) books. For me, the timing of discovering this framework could not be better as I am preparing documentation for propensity score analysis for an upcoming workshop I am giving. Of...

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