– E-20 –
Exponential regression, Logarithmic regression, Power
regression, and Inverse regression calculation
Statistics of
Q
and
W
. In addition, estimate of
y
for a given
x
and estimate of
x
for a given
y
. (Since the calculator con-
verts each formula into a linear regression formula before
actual calculation takes place, it obtains all statistics, ex-
cept coefficients
a
and
b
, from converted data rather than
entered data.)
Quadratic regression calculation
Statistics of
Q
and
W
and coefficients
a
,
b
,
c
in the quad-
ratic regression formula (
y
=
a
+
bx
+
cx
2
). (For quadratic
regression calculations, no correlation coefficient (
r
) can be
obtained.) When there are two
x
´
values, press
@≠
.
When performing calculations using
a
,
b
and
c
, only one nu-
meric value can be held.
¯x
Mean of samples (
x
data)
sx
Sample standard deviation (
x
data)
Q
σ
x
Population standard deviation (
x
data)
n
Number of samples
Σ
x
Sum of samples (
x
data)
Σ
x
2
Sum of squares of samples (
x
data)
¯y
Means of samples (
y
data)
sy
Sample standard deviation (
y
data)
σ
y
Population standard deviation (
y
data)
Σ
y
Sum of samples (
y
data)
W
Σ
y
2
Sum of squares of samples (
y
data)
Σ
x y
Sum of products of samples (
x
,
y
)
r
Correlation coefficient
a
Coefficient of regression equation
b
Coefficient of regression equation
c
Coefficient of quadratic regression equation
• Use
K
and
R
to perform a STAT variable calcula-
tion.
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