Monday, 13 November 2017

Snakes and Ladders and Transition Matrices

Recently, /u/mikeeg555 created this post  on the statistics subreddit with their results from a simulation of 10,000,000 games of this instance of Snakes and Ladders. This is the sort of information that's good to show in an undergrad or senior secondary level classroom as a highlight of the sort of insights you can get from the kind of simulation that anyone can program.

Wednesday, 8 November 2017

Writing a Resume as a Data Scientist or Statistician.

What do viral posts and resumes have in common? They rise to the top based on a very superficial evaluation.

Here are some notes from a seminar on resume writing for students, especially undergraduates, in statistics and data science.

Thursday, 2 November 2017

Evaluating Exam Questions using Crowdmark, IRT, and the Generalized Partial Credit Model

Making good exam questions is universally hard. The ideal question should have a clear solution to those with the requisite understanding, but also difficult enough that someone without the knowledge needed can guess at an answer.

An item response theory (IRT) based analysis can estimate the difficulty of a question, as well as the general skill of each of the test takers. The generalized partial credit model extends classical IRT from questions with binary scores to ones with an ordinal set of possible scores.

R code and example inside.