A look at the relationship between the pooled-variance t test and simple linear regression. I illustrate how the pooled-variance t test can be done as a regression, by declaring an appropriate indicator variable.

The Cairo traffic police officer data is simulated data with the same summary statistics as found in:

Kamal, A., Eldamaty, S., and Faris, R. (1991). Blood level of Cairo traffic policemen. Science of the Total Environment, 105:165Ð170.

I have just finished watching all your lectures for 12. Regression.

Thanks a lot for providing such resources. They helped me a tremendous amount and I admire the way you explained them:

– Right to the point

– Answering the most common questions

– Short and effective

– Perfectly pronounced

– Simple examples easy to follow

– Short but focused presentations

All these lectures helped me clarify some topics that were not clear to me: why the difference between the confidence and prediction interval, the usage of dummy variables, the leverage and influence.

Thanks a lot again for your contribution to this world. Your students must be very lucky with you.

Best regards,

Fernando.

Thanks so much Fernando. I’m very glad you’ve found my videos helpful. I agree with your assessment