Welcome to the IDRE Introduction to Regression in R Seminar!

This seminar will introduce some fundamental topics in regression analysis using R in three parts. The first part will begin with a brief overview of R environment and the simple and multiple regression using R. The second part will introduce regression diagnostics such as checking for normality of residuals, unusual and influential data, homoscedasticity and multicollinearity. The third part of this seminar will introduce categorical variables in R and interpret regression analysis with categorical predictor. The following seminar is based on R version 3.5.2

In this seminar, we will be using a data file that was created by randomly sampling 400 elementary schools from the California Department of Education’s API (Academic Performance Index) 2000 dataset. This data file contains a measure of school academic performance as well as other attributes of the elementary schools, such as class size, enrollment, socioeconomic status, etc.

The links to the seminars are here:

- Lesson 1: Simple and Multiple Regression
- Lesson 2: Regression Diagnostics
- Lesson 3: Regression with Categorical Predictors

The data file you need for this seminar is elemapi2v2. You can click on the link and save the data file in any folder you choose. You can also load the data file directly in the R environment from the web link. You will see how to read and load a file in R later in the seminar.

Click on the following link to download syntax for all three lessons: R code for the seminar: Left-click the link and copy and paste the code directly into the RStudio Editor or right-click to download.

R is a free software environment for statistical computing and graphics. You can download R from The Comprehensive R Archive Network, CRAN website or choose your preferred CRAN mirror and download R from there.

As an option to Rgui (the default R interface) you can use RStudio. RStudio can makes R easier to use. It includes a code editor, debugging & visualization tools. You can download RStudio desktop open source license for free from RStudio website.