Y603 Lectures
Online
Lecture #29
1. Two-way analysis of covariance
(ANCOVA)
Able to write appropriate SAS
commands to carry out a two-way ANCOVA analysis
Can interpret results from SAS printouts
based on two-way ANCOVA
Kirk's notations used for two-way ANCOVA
Terms to learn: adjusted means, post-hoc comparisons of
adjusted means
Concepts from SAS printout: LSMEANS, STDERR, PDIFF
2. Test of equal-slope assumption in ANCOVA
(a) Plot the data by treatment
groups between the covariate (X) and the dependent variable
(Y)
(b) test the equal-slop assumption with a
SAS statement
(c) Distinguish between 
derived from the same data set, and carry out a test among these
three 
.
3. Assignments:
(1) Review Sections 15.1-15.4 in
Kirk.
(2) Do problems 2, 7, 8, 9(a), 9(b),
9(d), 10(a), 10(b), and 10(d) of Chapter 15 in Kirk.
(3) Preview Section 15.9 in
Kirk.
