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In my role I have to produce a lot of run charts and control charts for monthly data, but sometimes there are processes behind the run charts that merit looking at the data on a daily basis. It can become impractical to start producing run c... [Read more...]

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Tasks: Compute the Effective Number of Parties by year and region Using the American National Election Studies, compute the Effective Number of Parties in the electorate across regions and years/waves. The data The data come from The American National Election Studies (ANES). The ANES is a survey that covers ... [Read more...]

A broad family of fast and effective forecast methods Exponential smoothing state space methods constitute a broad family of approaches to univariate time series forecasting that have been around for many decades and only in the twenty-first century pl... [Read more...]

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I spend a considerable time of my working hours with data processing where I often use the %in% R function as x %in% y. Whenever I need the negation of that, I used to write !(x %in% y). Not much of a hassle, but still, wouldn’t it be nicer ... [Read more...]

Have you used RForcecom to connect R to Salesforce? It’s really cool, and thanks to it using Bulk API, it’s absolutely rapid. Anyway, I recently came across a problem when trying to query records which had been edited based o... [Read more...]

Have you used RForcecom to connect R to Salesforce? It’s really cool, and thanks to it using Bulk API, it’s absolutely rapid. Anyway, I recently came across a problem when trying to query records which had been edited based o... [Read more...]

I recently attempted a Stylistic Analysis of the Pakistani Prime Minister’s speeches, in order to identify if his speeches exhibit different Stylistic patterns. Large differences would indicate possibilities of different writers. Background to this ... [Read more...]

.fusion-fullwidth-1 { padding-left: px !important; padding-right: px !important; }by Joseph Rickert I am ever-optimistic that on the weekend I will have enough time and bra... [Read more...]

Motivation I had to install RStudio Server in a computer recently upgraded to OS X Sierra. The steps are the same as in a previous post (RStudio Server on OS X El Capitan ) Homebrew setup If you don't have Homebrew installed you'll need to install it first. In my opinion ... [Read more...]

The chi-square test of independence is used to analyze the frequency table (i.e. contengency table) formed by two categorical variables. The chi-square test evaluates whether there is a significant association between the categories of the two variables. This article describes the basics of chi-square test and provides practical examples ... [Read more...]

This is post #3 on the subject of linear regression, using R for computational demonstrations and examples. We cover here residuals (or prediction errors) and the RMSE of the prediction line. The first post in the series is LR01: Correlation. Acknowledgments: organization is extracted from: Freedman, Pisani, Purves, Statistics, 4th ed., ... [Read more...]

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In learning more about text mining over the past several months, one aspect of text that I’ve been interested in is readability. A text’s readability measures how hard or easy it is for a reader to read and understand what a text is saying; it depe... [Read more...]

In learning more about text mining over the past several months, one aspect of text that I’ve been interested in is readability. A text’s readability measures how hard or easy it is for a reader to read and understand what a text is saying; it depends on how ... [Read more...]

A new version of the RcppExamples package is now on CRAN. The RcppExamples package provides a handful of short examples detailing by concrete working examples how to set up basic R data structures in C++. This version takes advantage of the updated d... [Read more...]