HP HP-15C Advanced Functions Handbook

Section 4: Using Matrix Operations
147
8. Optionally, press [c"l fg~l [3 to calculate and display the
residual sum of squares q2 and to calculate the current
solution b. Then press iRCLlfclp times to display 61; 62>..., bp
in turn.
9. Repeat steps 5 through 8 for each additional row.
Example: Use this program and the CPI data from the previous
example to fit the model
y = bl + b2x2 + b3x3 + r,
where y, x2, and xs represent the CPI, PPI, and UR (all as
precentages).
This problem involves p = 3 parameters, so matrix A should be
5X4. The rows of matrix A are (1, xm2, Xm3> Vm) f°r w = 1, 2,..., 11.
Each row has weight wm = 1.
Keystrokes
OiSTO||MATRIX|[A"|
3.9|R/S|
5.4 I
Display
2.0000
2.0000
2.0000
4
4.0000
0.0000
1.0000
2.0000
3.0000
4.0000
1.0000
5.0000
Run mode.
Reserves R0 through R2.
Activates User mode.
Clears matrix memory.
Dimensions matrix A to
5X4.
Stores zero in all elements.
Enters weight for row 1.
Enters xn.
Enters x12.
Enters x^.
Enters yj.
Updates factorization.
1|R/S|
19.3[R7s1
5.8|R/S|
11.5fR7sl
1.0000
2.0000
3.0000
4.0000
1.0000
5.0000
Enters weight for row 11.
Enters x.
Enters xn 3.
Enters yn.
Updates factorization.

HP HP-15C Specifications

General

Brand	HP
Model	HP-15C
Category	Calculator
Language	English