Casio fx-FD10 Pro, Руководство пользователя

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5-11
k
Graphing Statistical Calculation Results
While the parameter calculation result is on the display, you can graph the displayed
regression formula by pressing
6
(DRAW).
k
Linear Regression Graph
Linear regression uses the method of least squares to plot a straight line that passes close to
as many data points as possible, and returns values for the slope and
y
-intercept (
y
-coordinate
when
x
= 0) of the line.
The graphic representation of this relationship is a linear regression graph.
1
(CALC)
2
(X)
1
(
ax
+
b
) or
2
(
a
+
bx
)
6
(DRAW)
The following is the linear regression model formula.
y
=
ax
+
b
a
............. regression coefficient (slope)
b
............. regression constant term (
y
-intercept)
y
=
a
+
bx
a
............. regression constant term (
y
-intercept)
b
............. regression coefficient (slope)
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Med-Med Graph
When it is suspected that there are a number of extreme values, a Med-Med graph can be
used in place of the least squares method. This is similar to linear regression, but it minimizes
the effects of extreme values.
1
(CALC)
3
(Med)
6
(DRAW)
The following is the Med-Med graph model formula.
y
=
ax
+
b
a
.............. Med-Med graph slope
b
.............. Med-Med graph
y
-intercept
k
Quadratic/Cubic/Quartic Regression Graph
A quadratic/cubic/quartic regression graph represents connection of the data points of a
scatter diagram. It uses the method of least squares to draw a curve that passes close to
as many data points as possible. The formula that represents this is quadratic/cubic/quartic
regression.
Ex. Quadratic regression
1
(CALC)
4
(X^2)
6
(DRAW)