7-5-6

Graphing Paired-Variable Statistical Data

Drawing a Med-Med Graph

When you suspect that the data contains extreme values, you should use the Med-Med graph (which is based on medians) in place of the linear regression graph. Med-Med graph is similar to the linear regression graph, but it also minimizes the effects of extreme values.

uClassPad Operation

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

From the Graph window

Tap [Calc] [MedMed Line] [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: MedMed

Tap yto draw the graph.

The following is the Med-Med model formula.

y = a·x + b

a : Med-Med graph slopeb : Med-Med graph y-intercept

Tip

When specifying a list of frequency values, make sure that the list contains positive integers only. Non-integer values (such as those with a decimal part) cause an error during statistical calculations.

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