1276 search results for "latex"

Post 4: Sampling the person ability parameters

October 8, 2013
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Post 4: Sampling the person ability parameters

The previous post outlined the general strategy of writing a MH within Gibbs sampler by breaking the code into two levels: a high level shell and a series of lower-level samplers which do the actual work. This post discusses the … Continue reading →

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Parallel Tempering in R with Rmpi

October 6, 2013
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Parallel Tempering in R with Rmpi

My office computer recently got a really nice upgrade and now I have 8 cores on my desktop to play with. I also at the same time received some code for a Gibbs sampler written in R from my adviser. I wanted to try a metropolis-coupled markov chain monte carlo, , algorithm on it to The post Parallel...

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Post 2: Generating fake data

October 6, 2013
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Post 2: Generating fake data

In order to check that an estimation algorithm is working properly, it is useful to see if the algorithm can recover the true parameter values in one or more simulated "test" data sets. This post explains how to build such … Continue reading →

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Post 1: A Bayesian 2PL IRT model

October 4, 2013
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Post 1: A Bayesian 2PL IRT model

In this post, we define the Two-Parameter Logistic (2PL) IRT model, derive the complete conditionals that will form the basis of the sampler, and discuss our choice of prior specification. We can find the appropriate values of numerically in R … Continue reading →

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The Uncertainty of Predictions

October 2, 2013
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The Uncertainty of Predictions

There are many kinds of intervals in statistics.  To name a few of the common intervals: confidence intervals, prediction intervals, credible intervals, and tolerance intervals. Each are useful and serve their own purpose. I’ve been recently working on a couple of projects that involve making predictions from a regression model and I’ve been doing some

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Book example – iterative function systems for generating fractals

October 1, 2013
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Book example – iterative function systems for generating fractals

A number of people suggested that my book, Modeling Data With Functional Programming In R, be more upfront with examples …Continue reading »

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ROC curves and classification

September 30, 2013
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ROC curves and classification

To get back to a question asked after the last course (still on non-life insurance), I will spend some time to discuss ROC curve construction, and interpretation. Consider the dataset we’ve been using last week, > db = read.table("http://freakonometrics.free.fr/db.txt",header=TRUE,sep=";") > attach(db) The first step is to get a model. For instance, a logistic regression, where some factors were merged...

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RcppArmadillo 0.3.920.1

September 30, 2013
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Along with the Rcpp 0.10.5 release yesterday, a new minor release 0.3.920.1 of RcppArmadillo came out. It is based on Conrad's Armadillo 3.920.0 plus a minor fix, and uses some of the new Rcpp features. Both package is now on CRAN and also in Debian....

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Conditional Formatting Tables using R

September 28, 2013
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One thing that I had the opportunity to develop while working last year at Saint Paul Public Schools was figuring out a quick, easy, and painless way to do interactive report generation. When I arrived in the REA department at Saint Paul Public Schools, the report generation process was roughly as follows: 1. Do the analysis in SPSS...

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Google Summer of Code experiences

September 27, 2013
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Google Summer of Code experiences

In the followings you could hopefully read an enjoyable summary about my summer. Instead of going out regularly, like in the years before, I spent the majority of my time on R package-development. Before that change obviously there were some previous signs which showed me, life is not what it was before. I don't want to land on a...

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