7-5-14

Graphing Paired-Variable Statistical Data

Drawing a Logistic Regression Graph ( y =

 

c

 

)

1 + a·e–b·x

 

 

Logistic regression is best for data whose values continually increase over time, until a saturation point is reached.

u ClassPad Operation

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

From the Graph window

Tap [Calc] [Logistic 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: LogisticR

Tap yto draw the graph.

The following is the logistic regression model formula.

y =

 

 

c

 

 

 

 

1 + a·e–b·x

 

 

 

 

 

 

 

1

 

n

C

2

• MSe =

 

Σ yi –

-b·xi

 

n – 2

1 + a·e

 

 

 

 

i=1

 

Tip

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

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