7-5-13

Graphing Paired-Variable Statistical Data

Drawing a Sinusoidal Regression Graph ( y = a·sin(b·x + c) + d)

Sinusoidal regression is best for data that repeats at a regular fixed interval over time.

u ClassPad Operation

Start the graphing operation from the Statistics application’s Graph window or List window.

From the Graph window

Tap [Calc] [Sinusoidal Reg] [OK] [OK] ".

From the List window

Tap [SetGraph][Setting...], or G.

On the Set StatGraphs dialog box that appears, configure a StatGraph setup with the setting shown below, and then tap [Set].

Type: SinR

Tap yto draw the graph.

The following is the sinusoidal regression model formula.

y= a·sin(b·x + c) + d

 

1

 

n

• MSe =

 

Σ (yi – (a·sin (b·xi + c) + d ))2

n –

2

 

i=1

Tip

•Make sure that “Radian” is selected for the [Angle] setting on the Basic Format dialog box (page 14-3-2) before drawing a sinusoidal regression graph. The graph cannot be drawn correctly when the [Angle] setting is “Degree”.

•Certain types of data may cause calculation to take a long time. This is normal and does not indicate malfunction.

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