# Category: Class – Applied Statistics

## Choose Predictive Over Parametric Every Time

Gaze and wonder at picture which heads this article, which I lifted from John Haman’s nifty R package ciTools. The numbers in the plot are made up whole cloth to demonstrate the […]

## Correlation of Non-Procreative Sex & Lack of Traditional Religion

Gallup has published two new polls. The first estimates the percent of those desiring non-procreative sex in each state. The second guesses the percent of non-affiliation with traditional religion (Christianity). We can […]

## A Beats B Beats C Beats A

Thanks to Bruce Foutch who found the video above. Transitivity is familiar with ordinary numbers. If B > A and C > B and D > C, then D > A. But […]

## The Gremlins Of MCMC: Or, Computer Simulations Are Not What You Think

I don’t think we’re clear on what simulation is NOT. RANDOMNESS IS NOT NECESSARY, for the simple reason randomness is merely a state of knowledge. Hence this classic post from 12 June […]

## Free Probability-Statistics Class: Predictive Case Study 1, Part XI

Review! We left off with comparing the standard, out-of-the-box linear regression with our multinomial predictive observable model. The great weaknesses of the regression were probability leakage (giving positive probability to impossible values) […]

## Free Probability-Statistics Class: Predictive Case Study 1, Part X

Review! Last time we created four models of CGPA. Which is correct? They all are. Why? I should ask as a homework question, but I’ll remind us here. Since all probability is […]

## Free Probability-Statistics Class: Predictive Case Study 1, Part IX

Review! Last time we successfully computed our model (8):     (8) Pr(CGPA = i | guesses of new measures, grading rules, old obs, model), where i = 0,…,5. The model we selected […]

## Free Data Science Class: Predictive Case Study 1, Part VIII

Review! We’re continuing with the CGPA example. The data is on line, and of unknown origin, but good enough to use as an example. We will build a correlational model, keeping ever […]