Casio fx-9750G PLUS User Manual

Page 291

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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

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