6-20
k Power Regression Graph
Power regression expresses y as a proportion of the power of x . The standard power
regression formula is y = a Ă— x
b
, so if we take the logarithm of both sides we get
ln y = ln a + b Ă— ln x . Next, if we say X = ln x , Y = ln y , and A = ln a , the formula corresponds to
linear regression formula Y = A + b X.
1(CALC) 6( g) 4(Power)
6(DRAW)
The following is the power regression model formula.
y = a · x
b
a ..............regression coefficient
b ..............regression power
k Sinusoidal Regression Graph
Sinusoidal regression is best applied for cyclical data.
The following is the sinusoidal regression model formula.
y = a ·sin( bx + c ) + d
1(CALC) 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.
• Certain types of data may take a long time to calculate. This does not indicate malfunction.
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