May 7 - o Line doesn’t represent anything useful...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
May 7, 2008 Bivariate correlation and regression Introduction o We have two variables that are continuous: interval or ration level o One is an independent variable (X); one is a dependent variable (Y) Scatter plot 1: positive correlation / positive relationship o When one (independent) variable goes up, the other (dependent) variable goes up Scatter plot 2: negative correlation / negative relationship o When one (independent) variable goes down, the other (dependent) goes down Scatter plot 3; no correlation / no relationship
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: o Line doesn’t represent anything useful Regression line o Summarizes the scatter plot Cuts through the middle o Goes through the means of X and Y Goes through the average of X and Y o Minimizes residuals o Lets us make predictions for Y, based on X o E.g., what homicide rate would we predict in the poverty level is 20? o Out predictions are inexact, but they improve our ability to predict than if we had no information ( I have an example hand written if you would like to see it)...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online