Casio fx-85WA User Manual
Page 23
E-21
• Linear Regression
The regression formula for linear regression is: y
҃ A ѿ Bx.
• Example: Atmospheric Pressure vs. Temperature
Perform linear regression to deter-
mine the regression formula terms
and correlation coefficient for the
data nearby. Next, use the regres-
sion formula to estimate atmos-
pheric pressure at 18°C and tem-
perature at 1000 hPa.
Enter REG Mode (Linear Regression)
fx-85W:
q
q
2
1
Other models:
q
3
1
A
m
=
(Memory Clear)
10
P
1003
S
15
P
1005
S
20
P
1010
S
25
P
1011
S
30
P
1014
S
(Regression Coefficient A)
A
q
=
(Regression Coefficient B)
A
w
=
(Correlation Coefficient
r
)
A
J
=
(Atmospheric Pressure at 18°C)
18
A
b
(Temperature at 1000 hPa)
1000
A
O
• Quadratic Regression
• The regression formula for quadratic regression is:
y
= A + B
x
+C
x
2
.
• Input data using the following key sequence.
<
x
-data>
P
<
y
-data>
S
Temperature
Atmospheric
Pressure
10°C
1003 hPa
15°C
1005 hPa
20°C
1010 hPa
25°C
1011 hPa
30°C
1014 hPa
1007.48
00
4.642857143
00
30.
00
997.4
00
0.56
00
REG
0.982607368
00