User Manual

264

18 - 4 Calculating and Graphing Paired-Variable Statistical Data

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

, so if we take the logarithm of both

sides we get Iny = 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(DRAW)

a ...... regression coefficient

b ...... regression power

r ...... correlation coefficient

..... coefficient of determination

k Sine Regression Graph

Sine regression is best applied for phenomena that repeats within a specific

range, such as tidal movements.

y = a·sin(bx + c) + d

While the statistical data list is on the display, perform the following key operation.

6(g)5(Sin)

6(DRAW)

Drawing a sine regression graph causes the angle unit setting of the calculator to

automatically change to Rad (radians). The angle unit does not change when you

perform a sine regression calculation without drawing a graph.

P. 254