I say: if you are a data scientist or working on an analytics project, worry over columns not rows. In analytics “rows” are instances, and “columns” are possible measurements. For example: each click on a website might generate a row recording the visit, and this row would be populated with […]

Estimated reading time: 2 minutes

I (John Mount) am recommending a book that I just started reading. The publisher Manning recently reached out to me and asked if I would accept a free copy of Effective Data Science Infrastructure by Ville Tuulos in exchange for considering helping to promote it. No obligation to promote it, […]

Estimated reading time: 2 minutes

This is a short note on what machine learning fitting actually does. We usually teach: A correct statistical or machine learning fitting procedure will, with high probability, correctly identify or infer a system that is close to the one actually producing our training examples. For this to actually happen we […]

Estimated reading time: 2 minutes

One of the great conveniences of performing a data science style analysis using Jupyter is that Jupyter notebooks are literate containers that combine code, text, results, and graphs. This is also one of the pain points in working with Jupyter notebooks with partners or with source control. That is: Jupyter […]

Estimated reading time: 5 minutes

I just got back from a workshop meeting called Digital Transformation of Decision Analysis. This was a workshop organized by Eyas Raddad, David Matheson, and John-Mark Agosta. It was sponsored by The Society of Decision Professionals and Microsoft. Microsoft generously hosted at their new Experience Center at the Microsoft Silicon […]

Estimated reading time: 3 minutes

Taking a break from weekend’s Elden Ring gaming to work out the probability of winning a tournament. The article can be found here: Some Math Inspired by Losing in Elden Ring. It is a variation on a “persuasion by calculation of examples” style I am working on.

Estimated reading time: 23 seconds

Part of the deal of having a package up on CRAN is: at any time one may be sent an automated email like the following. Dear maintainer, Please see the problems shown on URL. Please correct before TODAY+14DAYS to safely retain your package on CRAN. The CRAN Team If this […]

Estimated reading time: 6 minutes

Introduction The data algebra is a Python system for designing data transformations that can be used in Pandas or SQL. The new 1.3.0 version introduces a lot of early checking and warnings to make designing data transforms more convenient and safer. An Example I’d like to demonstrate some of these […]

Estimated reading time: 12 minutes

Introduction A surprisingly tricky problem in doing data science or analytics in the database are situations where one has to re-map a large number of columns. This occurs, for example, in the vtreat data preparation system. In the vtreat case, a large number of the variable encodings reduce to table-lookup […]

Estimated reading time: 15 minutes