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19 - EN
•
Quadratic Regression
• The regression formula for quadratic regression is:
y = A + Bx + Cx
2
.
•
Example:
x
i
y
i
29 1.6
50 23.5
74 38.0
103 46.4
118 48.0
In the REG Mode:
Registration Coefficient A = -35.59856934
Registration Coefficient B =1.495939413
Registration Coefficient C = -6.71629667x 10
-9
y ha xi 16 = -13,38291067
x1 ha yi 20 = 47,14556728
x2 ha yi 20 = 175,5872105
Data Input Precautions
•
DT DT inputs the same data twice.
• You can also input multiple entries of the same data using SHIFT : . To input the data “20
and 30” five times, for example, press 20 - 30 SHIFT : 5 DT .
• The above results can be obtained in any order, and not necessarily trial shown above,
• Precautions when editing data input for standard deviation also apply for regression calculati-
ons.
Technical Information
When you have a problem......
If calculation results are not what you expect or if an error occurs, perform the following steps.
1. Press SHIFT CLR 2 (Mode) = to Initialize all modes and settings.
2. Check the formula you are working with to confirm it is correct.
3. Enter the correct mode and try performing the calculation again.
Perform quadratic regression to
determine the regression formula
terms for the data nearby. Next, use
the regression formula to estimate the
values for
(estimated value of y)
for xi = 16 and (estimated value of
x) for yi = 20.
© FAST ČR a. s.
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