Casio fx-9750G PLUS - Manual (Page 291)

263
Calculating and Graphing Paired-Variable Statistical Data
18 - 4
k k k k k Logarithmic Regression Graph
P.254 Logarithmic regression expresses y as a logarithmic function of x . The standard
logarithmic regression formula is y = a + b × In x , so if we say that X = In x , the
formula corresponds to linear regression formula y = a + b X.
6 (g)1(Log)
1 2 3 4 5 6
6 (DRAW)
a ...... regression constant term
b ...... regression coefficient
r ...... correlation coefficient
r 2 ..... coefficient of determination
k k k k k
Exponential Regression Graph
P.254 Exponential regression expresses y as a proportion of the exponential function of
x . The standard exponential regression formula is y = a × e bx , so if we take the
logarithms of both sides we get In y = In a + bx . Next, if we say Y = In y , and A = In a ,
the formula corresponds to linear regression formula Y = A + bx .
6 (g)2(Exp)
1 2 3 4 5 6
6 (DRAW)
a ...... regression coefficient
b ...... regression constant term
r ...... correlation coefficient
r 2 ..... coefficient of determination