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264
18 - 4 Calculating and Graphing Paired-Variable Statistical Data
kk
kk
k Power Regression Graph
P.254 Exponential regression expresses y as a proportion of the power of x. The
standard power regression formula is
y = a × x
b
, so if we take the logarithms of
both sides we get In
y = Ina + b × Inx. Next, if we say X = Inx, Y = Iny, and a = Ina,
the formula corresponds to linear regression formula Y = a + bX.
6(g)3(Pwr)
12345
6
6(DRAW)
a ...... regression coefficient
b ...... regression power
r ...... correlation coefficient
r
2
..... coefficient of determination
kk
kk
k Sine Regression Graph
Sine regression expresses the relationship between specific pair of data (vari-
ables) as a trigonometric function. Residual mean square partial differentiation is
expressed in the form of a matrix, and the iteration method is used to determine
the coefficient that minimizes the residual mean square.
y = a·sin(bx + c) + d
While the statistical data list is on the display, perform the following key operation.
6(g)5(Sin)
Iterat ........ number of iterations (Specify in the range of 1 to 16.)
Period...... domain
1(CALC)
P.254
6
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