All log in this course references to ln
HPM 881 (Spring 2013, Holmes)
HPM 881 Unit 6:
Specication Tests
Unit 6 - Specication tests
A2: Y=Xbeta+epsilon
So three guys a mathematician, an accountant, and a statistician are applying for a job.
The mathematici

HPM 881 (Spring 2012, Holmes)
Unit 8 - Heteroskedasticity
HPM 881 Unit 8:
Heteroskedasticity
Note: some texts refer to it as Heteroscedasticity. Due to its Greek origins, the k version is
preferred.
1
Description
The variance of the errors is not constant

HPM 881 (Spring 2013, Holmes)
Unit 2 - Introduction to Regression Analysis
HPM 881 Unit 2:
Introduction to Regression Analysis
In the Beginning. . .
. . . there was nothing. Just theorists. They came up with crazy ideas. And people listened
and believed.

HPM 881 (Spring 2013, Holmes)
Unit 1 - Intro and FAQ
HPM 881 Unit 1:
Introduction and FAQs
Why do we use regression analysis?
Health care policy analysts often want answers to questions such as:
Does more spending on health care improve health outcomes?

HPM 881 (Spring 2013, Holmes)
Unit 7 - Multicollinearity
HPM 881 Unit 7:
Multicollinearity
1
Description
The independent variables are correlated with each other
2
Technical Description
(X X )1 is big ( |X X | is small)
3
Examples
1. Education of husband

HPM 881 (Spring 2013, Holmes)
Unit 5 - Interpreting OLS results
HPM 881 Unit 5:
Interpreting OLS results
With the results in hand, we want to know how to interpret them.
1
Goodness of t
1.1
how well does the model work?
R-squared
We commonly want to know

HPM 881 (Spring 2013, Holmes)
Unit 4 - Multiple regression
HPM 881 Unit 4:
Multiple Regression
Lets dene some terminology:
Dependent Variable The left hand side variable, the outcome variable, the variable of which you
are interested in analyzing the dete

HPM 881 (Spring 2013, Holmes)
Unit 3 - Properties and Assumptions of OLS
HPM 881 Unit 3:
Properties and assumptions of OLS Estimators
Now that we have some estimators, lets talk about some of the key assumptions and the properties
of the estimators.
1
Ass