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HP HP-15C - Page 139

HP HP-15C
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Section
4:
Using Matrix
Operations
1 37
Registers used:
R0
and
R^.
Matrices used:
A, B, C, and D.
To
use
this
program:
1
.
Press
1
\T\
DIM
|
[jiJI
to
reserve registers
R0
and
R1
.
2.
Dimension matrix
A
according
to the
number
of
observa-
tions
n
and the
number
of
parameters
p by
pressing
n \]
3.
Dimension matrix
B
according
to the
number
of
observa-
tions
n
(and
one
column)
by
pressing
n \R
1
1
|T||DIM
|["§1.
4.
Press
|Tl|MATRIX|
1 to set
registers
R0
and
Rj.
5.
Press
(T|
|USER|
to
activate User
mode.
6.
For
each observation, store
the
values
of
ihep
variables
in a
row
of
matrix
A.
Repeat
this
for the n
observations.
7.
Store
the
values
of the
dependent variable
in
matrix
B.
8.
Press
[A]
to
calculate
and
display
the Res SS. The
Y-register
contains
the Reg SS and the
T-register contains
the
o2
estimate.
9.
Press
|RCL|
fp]
to
observe each
of the p
parameter estimates.
10. If
desired, press
[B]
to
recalculate
the
dependent variable
data
in
matrix
B.
Example:
Compare
two
regression models
of the
annual change
in
the
consumer price index
(CPI)
using
the
annual change
in the
producer
price index
(PPI)
and the
unemployment
rate
(UR):
y
=
bi
+
b2x2
+
6
3*
3
+ r and y =
b{
+
b2x2
+ r,
where
y,
x2,
and
x3
represent CPI,
PPI,
and UR
(all
as
percentages).
Use the
following
data
from
the
U.S.:

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