![HP 113394 - 12C Platinum Calculator User Manual Download Page 98](http://html.mh-extra.com/html/hp/113394-12c-platinum-calculator/113394-12c-platinum-calculator_user-manual_156456098.webp)
98 Section 6: Statistics Functions
File name: hp 12c pt_user's guide_English_HDPMF123E27 Page: 98 of 275
Printed Date: 2005/8/1
Dimension: 14.8 cm x 21 cm
Example:
Check the reliability of the linear estimate in the preceding example by
displaying the correlation coefficient.
Keystrokes Display
~
0.90
The correlation coefficient is close
to 1, so the sales calculated in the
preceding example is a good
estimate.
To graph the regression line, calculate the coefficients of the linear equation
y
=
A
+
Bx
.
1. Press 0
gR
to compute the
y-
intercept (
A
).
2. To compute the slope of the line (
B
) in RPN mode, press
1
gR~d~-
. To compute the slope of the line (
B
) in ALG mode,
press these keys: 1
gR~d-~}
.
Example:
Compute the slope and intercept of the regression line in the preceding
example.
Keystrokes
(RPN mode)
Display
0
gR
15.55
y-intercept (A); projected value for
x
= 0.
1
gR~d~-
0.001
Slope of the line (
B);
indicates the
change in the projected values
caused by an incremental change
in the
x
value.
Keystrokes
(ALG mode)
Display
0
gR
15.55
y-intercept (A); projected value for
x
= 0.
1
gR~d-~}
0.001
Slope of the line (
B);
indicates the
change in the projected values
caused by an incremental change
in the
x
value.
The equation that describes the regression line is:
y = 15.55 + 0.001x