Calculator fx-85W fx-85WA fx-300W fx-350TL User Guide

E-21

•Linear Regression

The regression formula for linear regression is: y  A  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)

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 + Bx +Cx

•Input data using the following key sequence.

x-data> P <y-data> S

Te m perature

Atmospheric

Pressure

10°C 1003 hPa

15°C 1005 hPa

20°C 1010 hPa

25°C 1011 hPa

30°C 1014 hPa

1007.48

4.642857143

30.

997.4

0.56

REG

0.982607368