LEXIBOOK GC1000i, Инструкция по эксплуатации, Страница: 34 / 75

GB
Copyright L
EXIBOOK
2002
- 34 -
●
If only x data is repeated (x data having the same value), enter y data or
y data or y data followed by a value
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 or x data
followed by a value representing the total number of times the data is repeated, and then
.
●
Regression
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 Regression coefficient of regression formula
Σ y - B Σ x n Σ xy - Σ x Σ y
A = B =
n n Σ x
2
- ( Σ x)
2
●
Estimated value x, and y based on the regression formula can be calculated using the following
formulas:
y = A + B x x =
(To obtain the estimated value y, is used, and to obtain estimated value x,
is used.)
●
The correlation coefficient r for input data can be calculated using the following formula:
n
Σ
xy -
Σ
x
Σ
y
r =
√ { n
Σ
x
2
-(
Σ
x)
2
} { n
Σ
y
2
-(
Σ
y)
2
}
*** 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 followed by the memory name and then
(i.e.
).
2.5.3 Linear regression
DT
DT
DT
DT
DT
SHIFT
;
SHIFT
;
SHIFT
,
SHIFT
,
SHIFT
,
^
Y A
B
^
^ ^
^
^
y
SHIFT
^
ALPHA EXE
EXE
W ALPHA
Key Operation
10 1003
15 1005
20 1010
25 1011
30 1014
÷
MODE
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
Display
10.
15.
20.
25.
30.
Remark
Clears memory
EXE SHIFT Scl
DT SHIFT
,
DT SHIFT
,
DT SHIFT
,
DT
SHIFT
,
DT
SHIFT
,
x
SHIFT
^