STAT519
2.12. Let
HW1
Zhenxia Liu
Jan. 25, 2013
1 2 3
a 0 0
A 4 5 6 , D 0 b 0 . Find DA , AD , and DAD .
7 8 9
0 0 c
Answer: By the multiplication of matrix, we get
a 0 0 1 2 3 a 2a 3a
DA 0 b 0 4 5 6 4b 5b 6b
0 0 c 7 8 9 7c 8c 9c
1 2 3 a 0 0 a 2b
Stat 519: Homework 2
Matthew Singer
February 14, 2013
All data tables have been pre-loaded from the data
les provided at the course website.
Table 1: Table 3.3 with the new z variable.
y1
y2
y3
z
1 35
3.50 2.80 107.10
2 35
4.90 2.70 105.50
3 40 30.00 4.38