Casio FX-9750GII-SC User Guide - Page 153
Power Regression Graph, Residual Calculation, and A =
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I Power Regression Graph Power regression expresses y as a proportion of the power of x. The standard power regression formula is y = a × xb, so if we take the logarithm of both sides we get In y = In a + b × In x. Next, if we say X = In x, Y = In y, and A = In a, the formula corresponds to linear regression formula Y = A + bX. (CALC)(E)(Pwr) (DRAW) The following is the power regression model formula. y = a·xb a regression coefficient b regression power I 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 (CALC)(E)(Sin) (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. I Logistic Regression Graph Logistic regression is best applied for time-based phenomena in which there is a continual increase until a saturation point is reached. The following is the logistic regression model formula. y= c 1 + ae-bx (CALC)(E)(E)(Lgst) (DRAW) • Certain types of data may take a long time to calculate. This does not indicate malfunction. I Residual Calculation Actual plot points (y-coordinates) and regression model distance can be calculated during regression calculations. 6-13