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(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
+
1
2
and
g
𝑥 =𝑥
2
1
2
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
+
1
2
.
(x)12
4. Input 𝑥
2
1
2
.
(x)12
5. Press . On the Table Range dialog box that appears, input values for
Start (Default: 1), End (Default: 5), and Step (Default: 1).
110.5
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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