Quadreg – Texas Instruments PLUS TI-89 User Manual
Page 503
486 Appendix A: Functions and Instructions
8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 486 of 132
The QR factorization is computed
numerically using Householder
transformations. The symbolic solution is
computed using Gram-Schmidt. The columns
in
qMatName
are the orthonormal basis
vectors that span the space defined by
matrix
.
QR m1,qm,rm ¸
Done
qm ¸
m
m
2
+ o
2
ë sign(møpì nøo)øo
m
2
+ o
2
o
m
2
+ o
2
møsign(møpì nøo)
m
2
+ o
2
rm ¸
m
2
+ o
2
møn+oøp
m
2
+ o
2
0
|
m
ø
pì n
ø
o
|
m
2
+ o
2
QuadReg
MATH/Statistics/Regressions menu
QuadReg
list1
,
list2
[
, [
list3
] [,
list4
,
list5
]
]
Calculates the quadratic polynomial
regression and updates the system statistics
variables.
All the lists must have equal dimensions
except for
list5
.
list1
represents xlist.
list2
represents ylist.
list3
represents frequency.
list4
represents category codes.
list5
represents category include list.
In function graphing mode:
{0,1,2,3,4,5,6,7}! L1 ¸
{1 2 3 ...}
{4,3,1,1,2,2,3,3}! L2 ¸
{4 3 1 ...}
QuadReg L1,L2 ¸
Done
ShowStat ¸
Note:
list1
through
list4
must be a variable
name or c1–c99. (columns in the last data
variable shown in the Data/Matrix Editor).
list5
does not have to be a variable name and
cannot be c1–c99.
¸
Regeq(x)
"y1(x) ¸
Done
NewPlot 1,1,L1,L2 ¸
Done
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