User's Guide

To recall this type of value: Perform this key operation:
Σ x
3
(S-SUM) (Σ x
3
)
Σ x
2
y (S-SUM) (Σ x
2
y )
Σ x
4
(S-SUM) (Σ x
4
)
Regression coefficient C
(S-VAR) (C)
xˆ
1
(S-VAR) ( xˆ
1
)
xˆ
2
(S-VAR) ( xˆ
2
)
yˆ (S-VAR) ( yˆ)
• The values in the above tables can be used inside of expressions the
same way you use variables.
Linear Regression
• The regression formula for linear regression is: y = A + B x .
Example: Atmospheric Pressure vs. T
emperature
Perform linear regression to determine the regression formula terms and
correlation coefficient for the data below.
Temperature Atmospheric Pressure
10°C 1003 hPa
15°C 1005 hPa
20°C 1010 hPa
25°C 1011 hPa
30°C 1014 hPa
Next, use the regression formula to estimate atmospheric pressure at -5°C
and temperature at 1000 hPa. Finally
, calculate the coefficient of
determination (r
2
) and sample covariance (
∑
xy - n ∙ x
-
∙ y
-
n - 1
).
34