by dvorakt | Apr 23, 2020 | Uncategorized
I have been a platinum member of Audible.com for the last decade or so. This means that for $240 I get 24 audio books per year. I listen to them when I run, mow the lawn, and on long drives. The average audiobook is about 9 hours, so an hour-long run, four or five...
by dvorakt | Jan 19, 2020 | data science
Showing cabinet departures for recent presidents was one of 56 “best and weirdest” charts of FiveThirtyEight in 2019. I asked my students to replicate the chart in Tableau. See if you can tell which of the above images is the FiveThirtyEight chart, and...
by dvorakt | Jun 18, 2019 | data science
In 2007, I published the Sample Annotated Paper in Econometrics in the Journal of Economic Education (JEE). That paper illustrated the structure of an econometrics paper: sections, presentation of descriptive statistics, results etc. Recently, a couple of colleagues...
by dvorakt | Jan 30, 2019 | data science
Train, validate and test partitions for out-of-time performance take planning and thought (This piece is also at TDS.) The purpose of supervised machine learning is to classify unlabeled data. We want algorithms to tell us whether a borrower will default, a customer...
by dvorakt | Mar 29, 2018 | data science, retirement plan design
A target date fund (TDF) is a sensible and increasingly common choice for retirement saving. My own employer, Union College, relies on Fidelity or TIAA TDFs as the default investment option. I was therefore curious to investigate recent reports that Fidelity is...
