Statistical Methods

Math 222 - Spring 2019

Friday, April 26

R Code. Two-way ANOVA: Gender and major vs. SAT math scores
R Code. Two-way ANOVA: Income vs. region and religion

Wednesday, April 24

R Code. Pairwise comparisons with ANOVA: Dandruff shampoos

Monday, April 22

Workshop. Contrasts in one-way ANOVA: Dandruff shampoos

Wednesday, April 17

R Code. One-way ANOVA: Baseball positions at bat

Monday, April 15

R Code. Logistic regression: GPA vs. success in calculus
Workshop. Multiple logistic regression: E-mail spam filter

Wednesday, April 10

R Code. Multiple linear regression model selection: Baby birthweights
R Code. Multiple linear regression model selection: Cats jumping

Monday, April 8

R Code. Multiple linear regression: 5k times vs. age and gender

Friday, April 5

R Code. Testing for significant correlations: Vietnam draft lottery
R Code. Log-transformations & linear regression: House price vs. area

Thursday, April 4

R Code. Confidence and prediction intervals for linear regression: Predict height from foot length

Monday, April 3

Workshop Inference for linear regression: 5k times vs. age

Monday, April 1

Slides Introduction to ANOVA for linear regression

Wednesday, March 27

Textbook Residual plots
R Code. Inference for linear regression: Marriage ages

Monday, March 25

R Code. Linear regression example: Midterm grades
Workshop. Linear regression practice: Lightning fatalities

Thursday, March 21

R Code. Chi-squared test for association: Gender vs. self-image
R Code. Making two-way tables in R

Wednesday, March 20

R Code. Chi-squared goodness of fit test: World populations and Benford's law

Monday, March 18

Workshop. Bootstrap practice: Heroin treatment times
Workshop. Bootstrap practice: Correlation between ages of husbands and wives

Friday, March 8

R Code. Bootstrap confidence intervals: Standard deviation of annual rainfall

Thursday, March 7

R Code. Permutation tests for quantitative data: Cloud seeding
R Code. Permutation tests for matched pairs data: Helium filled footballs

Wednesday, March 6

Workshop. Permutation tests: Dolphin therapy

Wednesday, February 27

R Code. Log-transforming data: Turbity
R Code. Choosing the right transformation: Textbook prices

Monday, February 25

R Code. Two-sample t-tests: Cloud seeding
R Code. Simulating confidence intervals: Two skewed populations

Friday, February 20

R Code. Two sample t-tests: Do women talk more than men?

Wednesday, February 20

Workshop. t-Tests for matched pairs data: Helium filled footballs and marriage ages

Monday, February 18

History. William Gosset's 1908 paper about the t-distribution
R Code. t-values aren't normal: Bellville revisted

Friday, February 15

Workshop. Simulating confidence intervals: Bellville vs. Skewton

Thursday, February 14

R Code. Simulating confidence intervals

Monday, February 11

Video. Helper, hinderer study
Picture. Bob vs. Tim

Wednesday, February 6

R Code. Checking normality with quantile-quantile plots

Monday, January 28

Example. Central Limit Theorem

Thursday, January 24

R Code. Visualizing data with R

Wednesday, January 23

Workshop. Exploratory Data Analysis with R: High Bridge Half-Marathon 2018 Results (html, Rmd, txt)

Monday, January 21

Workshop. Introduction to R and RStudio

Monday, January 14

Slides. Three case studies