September 02, 2003

Bivariate Relationships

To get a flavor of what is to come this semester, we did a quick overview of bivariate relationships.

The covariance and correlation are fundamental measures of a bivariate relationship.

P9020022a.JPG

we took a look at how this works for a simple linear relation between two variables.

P9020020a.JPG

A couple of alternative representations of the same data:

P9020021a.JPG

We can also draw more general diagrams of correlations not equal in absolute value to one.

P9020023a.JPG

Finally, a little algebra shows how the covariance was invented:

P9020024a.JPG


Posted by bparke at 11:31 PM