Sharp EL-509E - Exponential Regression, Logarithmic Regression, Power Regression, and Inverse Regression Calculation; Quadratic Regression Calculation

– 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 xy 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.
509E_en0610.p65 04.6.10, 2:52 PM20