LEXIBOOK GC1000i, Инструкция по эксплуатации, Страница: 35 / 75

GB
Copyright L
EXIBOOK
2002
Example
xi yi
29 1.6
50 23.5
74 38.0
103 46.4
118 48.9
The data in the above can be
used to obtain the terms of
the regression formula and
the correlation coefficient.
Based on the regression
formula, estimated value y
can be obtained for xi=80,
and estimated value x can be
obtained for yi=73.
*** Erroneous data clearing / correction (correct data operation: 10 1003 )
1) If 11 1003 is entered, enter correct data after pressing .
2) If 11 1003 is entered, enter correct data after pressing .
3) If 11 1003 is entered previously, enter correct data after pressing 11
1003 .
2.5.4 Logarithmic regression
●
The regression formula is y=A+B.lnx. Enter the x data as the logarithm (ln) of x, and the y data inputs
the same as that for linear regression.
●
Estimated values x, and y based on the regression formula can be calculated using the following
formulas:
y = A +B lnx x = exp
●
The same operation as with linear regression can be used to obtain the regression coefficient and for
making corrections. To obtain the estimated value y,
x is used, and to
obtain estimated value x, y is used.
Furthermore, Σ x, Σ x
2
and Σ xy are obtained by Σ lnx, Σ (lnx)
2
, and Σ lnx.y respectively.
Key Operation
29 1.6
50 23.5
74 38.0
103 46.4
118 48.9
80
73
- 35 -
18
1000
1
The data in the above can
be used to obtain the terms
of the regression formula
and the correlation
coefficient. Based on the
regression formula, the
estimated length of the
steel bar at 18°C an the
temperature when the bar
is 1000mm long can be
calculated. The critical
coefficient (r
2 ) and
covariance
997.4
0.56
0.982607368
1007.48
4.642857143
0.965517241
35.
Constant term A.
Regression coefficient B
Correlation coefficient r
Length at 18º C.
Temperature at 1000mm
Covariance
EXE SHIFT A
EXE SHIFT
EXE R SHIFT
EXE y SHIFT
EXE x SHIFT
EXE R SHIFT x 2
B
EXE
R ALPHA W ALPHA
W ALPHA
(
)
)
(
÷
SHIFT
x
SHIFT
x x
y
-
-
SHIFT
,
SHIFT
,
CL
AC
SHIFT
,
DT
DT
SHIFT
,
SHIFT
,
DT
CL
^
^
^ ^
^
^
^
^
^
 
y - A
B
EXE in
In
SHIFT
y ^
EXE
X SHIFT
Ans EXE
e x SHIFT
÷
MODE
Display
3.36729583
3.912023005
4.304065093
4.634728988
4.770684624
-111.1283976
34.02014748
0.994013946
37.94879482
224.1541314
Remark
Clear memory
Constant term A
Regression coefficient B
Correlation coefficient r
y when xi=80
x when yi=73
EXE SHIFT Scl
EXE
EXE
SHIFT In
EXE SHIFT A
EXE
SHIFT B
EXE R SHIFT
DT SHIFT
,
In DT
SHIFT
,
In DT SHIFT
,
In DT SHIFT
,
In DT SHIFT
,
y
^
EXE SHIFT
x ^
Ans
e x SHIFT
^
^