Psychology 202b Advanced Psychological Statistics, II January 27, 2011

Overview The efficiency of matrix algebra Simple linear regression Basic concepts Review of graphics for regression Simulating linear regression data

Simple linear regression The book’s example in SAS ( What very important step did the book skip? We’ll take a look at ways to perform graphics in a moment, but first…

Basic concepts Your book talks about prediction and explanation Regression as a model for conditional mean Breaking models into the part that we care about and the part that we don’t.

Review of graphics for regression proc gplot in SAS. It is easier to control graphics in R. Overview of the scatterplot in R.

Simulating linear regression data Illustration in R.