(Regression)
(r)
0.998
(Regression)
(a)
-3857.984
(Regression)
(b)
2357.532
Calculating Estimated Values
Based on the regression formula obtained by paired-variable statistical
calculation, the estimated value of
y
can be calculated for a given
x
-value.
The corresponding
x
-value (two values,
x
1
and
x
2
, in the case of quadratic
regression) also can be calculated for a value of
y
in the regression formula.
Ex 4:
To determine the estimate value for
y
when
x
= 160 in the regression
formula produced by logarithmic regression of the data in Ex 3. Specify Fix
3 for the result. (Perform the following operation after completing the
operations in Ex 3.)
160
(Regression)
(
𝑦
)
8106.898
Important:
Regression coefficient, correlation coefficient, and estimated
value calculations can take considerable time when there are a large
number of data items.
Creating a Number Table
The Table Mode generates a number table based on one or two functions.
Example:
To generate a number table for the functions
𝑓 𝑥 = 𝑥
2
+ 12
and
g
𝑥 = 𝑥
2
− 12
for the range
-1 ≦ 𝑥 ≦ 1
, incremented in steps of 0.5
1. Press
, select the Table Mode icon, and then press
.
2. Configure settings to generate a number table from two functions.
(SETUP)
(Table)
(
f
(
x
),
g
(
x
))
3. Input
𝑥
2
+ 12
.
(
x
)
1
2
4. Input
𝑥
2
− 12
.
(
x
)
1
2
5. Press
. On the Table Range dialog box that appears, input values for
Start (Default: 1), End (Default: 5), and Step (Default: 1).
1
1
0.5
6. Press
to generate the number table.
• Press
to return to the screen in
step 3.
Tip
• In the number table shown in step 6, you can change the value in the
currently highlighted
x
cell. Changing the
x
value causes the
f
(
x
) and
g
(
x
)
values in the same line to be updated accordingly.
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