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Regression Graph Operations (Curve Fitting)
After plotting a scatter graph using paired-variable (
graph that approximates the scatter graph and determine the regression formula.
u To plot a scatter graph and then draw its regression graph
1. Enter the paired-variable data into the spreadsheet, and then select the range of cells where it is located.
• For information about how data is treated based on the range of cells that are selected, see "[Graph] -
[Scatter]" (page 241) under "Graph Menu and Graph Examples".
2. Tap [Graph] and then [Scatter].
• This will open the Graph window in the lower half of the display and plot the scatter graph.
3. When plotting a scatter graph with multiple
drawing the regression graph by tapping it.
4. On the Graph window, perform the following steps.
To draw this:
Linear regression curve
Med-Med graph
Quadratic regression curve
Cubic regression curve
Quartic regression curve
Quintic regression curve
Logarithmic regression curve
bx
a e
Exponential
regression curve
x
a b
Exponential
regression curve
Power regression curve
Sinusoidal regression curve
Logistic regression curve
• This superimposes the regression graph on the scatter graph. Also, the
regression calculation result window will appear in the upper half of the
display (except for Quintic Reg).
• Here, you can add a another regression graph by selecting a different
[Calc] menu item. Also, you can repeat step 3 to overlay a regression
graph for a different
5. To clear all regression graphs, tap [Edit] - [Clear All].
• You can also delete a particular regression graph by tapping to select it,
and then tapping [Edit] - [Delete].
y
-values, select one of the
y
-value.
x
,
y
) data on the spreadsheet, you can draw a regression
y
Select this [Calc] menu item:
Linear Reg
MedMed Line
Quadratic Reg
Cubic Reg
Quartic Reg
Quintic Reg
Logarithmic Reg
Exponential Reg
abExponential Reg
Power Reg
Sinusoidal Reg
Logistic Reg
Chapter 13: Spreadsheet Application 242
-value plots that you want to use for
Or tap this:
d
2
f
g
h
j
l
k
4
;
5
6
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