E-42
Quadratic regression calculation
Statistics of ① and ②, and coeffi cients
a, b, c in
the quadratic regression formula (
y = a + bx + cx
2
).
(For quadratic regression calculations, no correlation
coeffi cient (
r) can be obtained.) When there are two x´
values, each value will be displayed with “1:” or “2:”, and
stored separately in the X and Y memories.
Euler exponential regression, logarithmic
regression, power regression, inverse regression,
and general exponential regression calculations
Statistics of ① and ②. In addition, the estimate of
y for
a given
x and the estimate of x for a given y. (Since the
calculator converts each formula into a linear regression
formula before actual calculation takes place, it obtains all
statistics, except coeffi cients
a and b, from converted data
rather than entered data.)
①
x
–
Mean of samples (x data)
sx
Sample standard deviation (x data)
σx
Population standard deviation (x data)
n
Number of samples
Σx
Sum of samples (x data)
Σx
2
Sum of squares of samples (x data)
②
y
–
Mean of samples (y data)
sy
Sample standard deviation (y data)
σy
Population standard deviation (y data)
Σy
Sum of samples (y data)
Σy
2
Sum of squares of samples (y data)
Σx
y
Sum of products of samples (x,
y
)
r
Correlation coeffi cient
a
Coeffi cient of regression equation
b
Coeffi cient of regression equation
c
Coeffi cient of quadratic regression equation
• Use
;
and
t
to perform a variable calculation
in STAT mode.
•
U
does not function in STAT mode.
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