Monday, April 23, 2018

Mathisfun.com's Least Squared Error calculator

Mathisfun.com bills this as a Least Squared Error calculator, but I don't think it is a calculator. I think it is a nice visual aid that demonstrates how the regression line/equation change as your data changes.

The static photo below doesn't do this interactive website justice. You can drag and drop any of the dots on the scatter plot and watch as the regression line and regression line equation are recalculated to best predict Y based on X.


It doesn't explicitly show the math going on behind the scenes, but it is a nice compliment to your LSE lecture.





https://www.mathsisfun.com/data/least-squares-calculator.html

Monday, April 2, 2018

Chi-square via The Onion's "Saying ‘Smells Okay’ Precedes 85% Of Foodborne Illnesses Annually"

Once again, The Onion publishes satire research (which should be, like, a submission category for JPSP) claiming to study phrases uttered before food poisoning happens.

https://www.theonion.com/report-saying-smells-okay-precedes-85-of-foodborne-1819579726

I've turned this fake research into fake data to conduct an actual chi-square test of goodness of fit.

Here is data that will give you a significant chi square, with 85% of participants falling into the "smells okay" category.


Did sick person say aid "Smells Okay" before eating leftovers?
No Yes
19 106

Tuesday, March 27, 2018

Press Roger's statistics infographics

Press Rogers is a very generous person who has created a number of documents that illustrate the thinking/math behind a variety of statistics. Here is his illustration for ANOVA, which includes one way, two way, repeated measured, and mixed.

https://pressrogers.com/documents/anova-overview/

PS: I found out about this resource via the Society for the Teaching of Psychology FB group, which is active and filled with great advice about teaching statistics as well as other psychology topics.