Sharp EL738C EL-738 Operation Manual - Page 69

Exponential regression, logarithmic regression, pow, er regression, and inverse regression

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The estimate of y for a given x (estimate y´) and the estimate of x for a given y (estimate x´) can also be found. When there are two x values, the COMP symbol will appear. Press @ to switch between x values. Exponential regression, logarithmic regression, power regression, and inverse regression calculations Section ቢ and ባ results, except for coefficients c. The estimate of y for a given x (estimate y´) and the estimate of x for a given y (estimate x´) can also be found. Because the calculator converts each formula into a linear regression before actual calculation takes place, it obtains all statistics - except coefficients a and b - from converted data rather than from entered data. Variables Content n Number of samples x Mean of samples (x values) sx Sample standard deviation (x values) ᶃ σx Population standard deviation (x values) Σx Sum of samples (x values) Σx2 Sum of squares of samples (x values) y Mean of samples (y values) sy Sample standard deviation (y values) σy Population standard deviation (y values) Σy Sum of samples (y values) Σy2 Sum of squares of samples (y values) ᶄ Σxy Sum of products of samples (x, y) a Coefficient of regression equation b Coefficient of regression equation c Coefficient of quadratic regression equation r Correlation coefficient • Use i or f to perform a variable calculation in STAT mode. 68

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68
The estimate of
y
for a given
x
(estimate
y
´) and the estimate
of
x
for a given
y
(estimate
x
´) can also be found. When there
are two
x
values, the
COMP
symbol will appear. Press
@
to
switch between
x
values.
Exponential regression, logarithmic regression, pow-
er regression, and inverse regression calculations
Section
±
and
²
results, except for coefficients
c
.
The estimate of
y
for a given
x
(estimate
y
´) and the estimate
of
x
for a given
y
(estimate
x
´) can also be found. Because the
calculator converts each formula into a linear regression before
actual calculation takes place, it obtains all statistics — except
coefficients
a
and
b
— from converted data rather than from
entered data.
Variables
Content
①
n
Number of samples
x
Mean of samples (
x
values)
sx
Sample standard deviation (
x
values)
σ
x
Population standard deviation (
x
values)
Σ
x
Sum of samples (
x
values)
Σ
x
2
Sum of squares of samples (
x
values)
②
y
Mean of samples (
y
values)
sy
Sample standard deviation (
y
values)
σ
y
Population standard deviation (
y
values)
Σ
y
Sum of samples (
y
values)
Σ
y
2
Sum of squares of samples (
y
values)
Σ
xy
Sum of products of samples (
x
,
y
)
a
Coefficient of regression equation
b
Coefficient of regression equation
c
Coefficient of quadratic regression equation
r
Correlation coefficient
• Use
i
or
f
to perform a variable calculation in STAT
mode.