Casio FX-CG10 Manual do Utilizador descarregar pdf (Página 210)

100

101

6-17

Cubic regression

Model formula .......

y = ax

+ bx

+ cx + d

..........regression third coefficient

b ..........regression second coefficient

c ..........regression first coefficient

d ..........regression constant term

( y -intercept)

Quadratic regression

Model formula .......

y = ax

+ bx + c

..........regression second coefficient

b ..........regression first coefficient

c ..........regression constant term

( y -intercept)

k Med-Med Graph

When it is suspected that there are a number of extreme values, a Med-Med graph can be

used in place of the least squares method. This is similar to linear regression, but it minimizes

the effects of extreme values.

1(CALC) 3(Med)

6(DRAW)

The following is the Med-Med graph model formula.

y = ax + b

..............Med-Med graph slope

b ..............Med-Med graph y -intercept

k Quadratic/Cubic/Quartic Regression Graph

A quadratic/cubic/quartic regression graph represents connection of the data points of a

scatter diagram. It uses the method of least squares to draw a curve that passes close to

as many data points as possible. The formula that represents this is quadratic/cubic/quartic

regression.

Ex. Quadratic regression

1(CALC) 4(X

)

6(DRAW)

Quartic regression

Model formula .......

y = ax

+ bx

+ cx

+ dx + e

..........regression fourth coefficient

b ..........regression third coefficient

c ..........regression second coefficient

d ..........regression first coefficient

e ..........regression constant term ( y -intercept)

1 2 ... 205 206 207 208 209 210 211 212 213 214 215 ... 600 601

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