10.3.1 Scatterplot matrix. Recall that we use SAS’s scatterplot matrix feature to quickly scan for pairs of explanatory variables that might be colinear. To do this in R we must first make sure we ...

Linear Regression vs. Multiple Regression Example . Consider an analyst who wishes to establish a relationship between the daily change in a company's stock prices and daily changes in trading volume.

In the regression output above, we can see that for every one-point change in Visa, there is a corresponding 1.36-point change in the S&P 500.

Multiple regression models with survey data. Regression becomes a more useful tool when researchers want to look at multiple factors simultaneously. If we want to know whether the racial divide ...