Summer
Lectures
Lecture #18
1. Analysis of covariance (ANCOVA)
continued
Able to write appropriate SAS commands to
carry out a one-way ANCOVA analysis
Can interpret results from SAS printouts based on
one-way ANCOVA
Kirk's notations used for one-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)
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Last updated: November 24, 1998
URL:
http://www.indiana.edu/~jopeng/Y603/summer/sum18.html
Comments: jopeng@indiana.edu
Copyright
1998, The Trustees of Indiana
University
