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R Programming Notes
I’ve been on a note taking binge recently. This post covers a variety of topics related to programming in R. The contents were gathered from many sources and structured in such a way that it provided...
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Introduction to the RMS Package
The rms package offers a variety of tools to build and evaluate regression models in R. Originally named ‘Design’, the package accompanies the book “Regression Modeling Strategies” by Frank Harrell,...
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Statistics Refresher
Let’s face it, a good statistics refresher is always worthwhile. There are times we all forget basic concepts and calculations. Therefore, I put together a document that could act as a statistics...
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Examining Website Pathing Data Using Markov Chains
A markov model can be used to examine a stochastic process describing a sequence of possible events in which the probability of each event depends only on the state attained in the previous event....
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Using csvkit to Summarize Data: A Quick Example
As data analysts, we’re frequently presented with comma-separated value files and tasked with reporting insights. While it’s tempting to import that data directly into R or Python in order to perform...
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Working With SEM Keywords in R
The following post was republished from two previous posts that were on an older blog of mine that is no longer available. These are from several years ago, and related to two critical questions that I...
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R Programming Notes – Part 2
In an older post, I discussed a number of functions that are useful for programming in R. I wanted to expand on that topic by covering other functions, packages, and tools that are useful. Over the...
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Data.Table by Example – Part 1
For many years, I actively avoided the data.table package and preferred to utilize the tools available in either base R or dplyr for data aggregation and exploration. However, over the past year, I...
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Data.Table by Example – Part 2
In part one, I provided an initial walk through of some nice features that are available within the data.table package. In particular, we saw how to filter data and get a count of rows by the date. dat...
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Data.Table by Example – Part 3
For this final post, I will cover some advanced topics and discuss how to use data tables within user generated functions. Once again, let’s use the Chicago crime data. dat = fread("rows.csv")...
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