I wrote a tool, qstats, that computes simple summary statistics from the command-line. It also includes data-binning and simple bar chart functionality. I designed it, in C, specifically to be as fast as possible, and bare-bones enough to work on any POSIX-compliant system without having to deal with outside dependencies. …

GNU datamash is a command-line utility that offers simple calculations (e.g. count, sum, min, max, mean, stdev, string coalescing) as well as a rich set of statistical functions, to quickly assess information in textual input files or from a UNIX pipe. .... Let’s calculate the mean, 1st quartile, median, 3rd quarile, IQR, sample-standard-deviation, and p-value of Jarque-Bera test for normal distribution, using some data in file.txt. …

Jeff Leek, Brian Caffo, and I launched the Johns Hopkins Data Science Specialization on the Coursera platform. This is a sequence of nine courses that intends to provide a “soup-to-nuts” training in data science for people who are highly motivated and have some basic mathematical and computing background. …

Introduction to Unix command line tools for data processing, with examples of awk, sed, sort, uniq, cut, split, join, cat, conditionals, loops, and references.