Latent class analysis is a useful tool that is used to identify groups within multivariate categorical data.  An example of this is the likert scale. In categorical language these groups are known as latent classes. As a simple comparison this can be compared to the k-means multivariate cluster analysis. There ... [Read more...]

Interval estimation of the population mean can be computed from functions of the following R packages:stats - contains the t.test;TeachingDemos - contains the z.test; and,BSDA - contains the zsum.test and tsum.test.The t.test of the stats package is a ... [Read more...]

Interval estimation of the population mean can be computed from the functions of the following R packages:stats - contains the t.testTeachingDemos - contains the z.testBSDA - contains the zsum.test and tsum.testThe t.test of the stats package is a stud... [Read more...]

The creator of S language which R is derived from John Chambers said in one of his books  Software for data analysis programming with R: ...This places an obligation on all creators of software to program in such away that the computations ca... [Read more...]

In this post, I use a Shiny app in R to determine the best possible players to pick in a fantasy football auction draft.  The app takes projections from FantasyPros,[...] The post Win Your Fantasy Football Auction Draft: Calculate the Optimal Players to Draft with this Shiny App in R ... [Read more...]

Bill Grosso presented a fascinating webinar about the video gaming industry today, Knowing How People are Playing Your Game Gives You the Winning Hand. He described how over the past three years, game studios have switched from viewing analytics as a primarily descriptive tool to deploying modern data collection practices, ... [Read more...]

OBS: This is a full translation of a portuguese version. In many different types of experiments, with one or more treatments, one of the most widely used statistical methods is analysis of variance or simply ANOVA . The simplest ANOVA can be called “one way” or “single-classification” and involves the analysis ... [Read more...]

Inspired by this post on R-bloggers, I decided to check how BCEA was doing. Unfortunately, it does not feature in the top 100 most downloaded R packages. However, I think it's doing well $-$ considering the book (which is the main medium of advertising of the package) has been out for ... [Read more...]

I have asked by a few people lately to help walk them through using twitter API in R, and I’ve always just directed them to the blog post I wrote last year during the US presidential debates not knowing that Twitter had changed a few things. Having my interest ... [Read more...]

[This article was first published on R-statistics blog » RR-statistics blog, and kindly contributed to R-bloggers]. (You can report issue about the content on this page [Read more...]

Google's prediction API offers a blackbox way of doing some prediction. They had advertised an R package, but it doesn't seem to work with the new version of the prediction API or their OAuth2 authentication mechanism. So, in an effort to check out the... [Read more...]

One great thing about R is that has a wide diversity of packages written by many different people of many different viewpoints on how software should be designed. However, this does tend to bite us periodically.  When I teach newcomers about R and... [Read more...]

This article from my other blog may be of interest to readers of this blog: http://seriousstats.wordpress.com/2013/04/18/using-multilevel-models-to-get-accurate-inferences-for-repeated-measures-anova-designs/ [Read more...]

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My book continues growing. I have recently completed the first version of the Spatio-Temporal visualization chapters. Moreover, a significant part …Continuar leyendo » [Read more...]

I have updated my package solaR. This package provides calculation methods of solar radiation and performance of photovoltaic systems from …Continuar leyendo » [Read more...]

Here is a post with some information to control the layout of your graph produced by the ggplot library: http://rpubs.com/Lionel/6557 Enjoy!Filed under: R and Stat Tagged: ggplot, R [Read more...]

Another maintenance release of inline is now on CRAN and in already included in Debian. This release was triggered by a change in the development version of R which removed an argument to package.skeleton(). The complete NEWS entry is below. Chan... [Read more...]

How does overdispersion of infections affect the behavior of the multiple-infection model? I redefine the model to account for overdispersion, assuming the same overdispersion occurs in both age classes. The parameter varies inversely with the degree of overdispersion. Again, the classes are demographically identical, and infection affects mortality but not ... [Read more...]

by Joseph Rickert Quandl.com, the open source website for financial data, made rapid progress earlier this year in becoming an R friendly source for financial time series data. Tammer Kamel, Quandl’s founder introduced the site on Revolutions blog in late February as a “search engine” for numerical data ... [Read more...]