Casio fx-50F Sxy, Sxx, Sxx.Syy, n = abx, n = axb, lnb

Command

Calculation Formula

Estimated Value m

m=

lny – lna

lnb

Estimated Value n

n = abx

Power Regression

Command

Calculation Formula

Regression Formula

a

= exp(

Σlnyi – b.Σlnxi

)

Constant Term a

n

Regression Coefficient b

b

=

n.Σlnxilnyi – Σlnxi.Σlnyi

n.Σ(lnxi)2 – (Σlnxi)2

n

.Σ

lnxiln

y

i

–

Σ

lnxi

.Σ

Correlation Coefficient r

r

=

lnyi

{n.Σ(lnxi)2 – (Σlnxi)2}{n.Σ(lnyi)2 – (Σlnyi)2}

Estimated Value m

ln y – ln a

m

= e

b

Estimated Value n

n = axb

Inverse Regression

Command

Calculation Formula

Regression Formula

a

=

Σyi – b.Σxi–1

Constant Term a

n

Regression Coefficient b

b =

Sxy

Sxx

Correlation Coefficient r

r

=

Sxy

Sxx.Syy

However,

–1

)

2

Sxx = Σ(xi–1)2–

(Σxi

n

Syy = Σyi2– (Σnyi)2Sxy = Σ(xi–1)yi– Σxi–n1.Σyi

E-49