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GB
If only x data is repeated (x data having the same value), enter
G
SHIFT
representing the number of times the data is repeated, and then
If only y data is repeated (y data having the same value), enter x data
G
;
.
DT
Regression
G
The following are the formulas the unit uses to calculate constant term A and regression coefficient
B for the regression formula y= A+B x.
Constant term of regression formula
A =
Estimated value x, and y based on the regression formula can be calculated using the following
G
formulas:
^
y = A + B x
(To obtain the estimated value y,
is used.)
^
x
The correlation coefficient r for input data can be calculated using the following formula:
G
r =
*** The values for n, Sx, Sx2, Sxy, Sy, and Sy2 are stored in memories W, V, U, R, Q and P respectively,
and can be obtained by pressing
).
EXE
2.5.3 Linear regression
Example
Relationship between tem-
perature and the length of
steel bar
Temperature Length
10º C
1003mm
15º C
1005mm
20º C
1010mm
25º C
1010mm
30º C
1014mm
- 34 -
y data
or
,
DT
SHIFT
followed by a value representing the total number of times the data is repeated, and then
Σy - B Σx
n
^
^
Y A
^
x =
B
^
^
y
SHIFT
n Σxy - Σx Σy
√ {n Σx
} {n Σy
-(Σx)
-(Σy)
}
2
2
2
2
followed by the memory name and then
ALPHA
Key Operation
÷
MODE
SHIFT
Scl
EXE
,
10
1003
SHIFT
DT
,
15
1005
SHIFT
DT
20
,
1010
DT
SHIFT
,
25
1011
SHIFT
DT
,
30
1014
SHIFT
DT
y data
,
SHIFT
y data
followed by a value
,
;
SHIFT
.
DT
or x data
DT
Regression coefficient of regression formula
n Σxy - Σx Σy
B =
n Σx
- (Σx)
2
2
is used, and to obtain estimated value x,
(i.e.
EXE
Display
Remark
Clears memory
10.
15.
20.
25.
30.
Copyright L
EXIBOOK
or
DT
SHIFT
^
SHIFT
ALPHA
W
2002
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