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- How do I check the kind of distribution of a sample data?

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Dec 28, 2016 5:57 AM
(3368 views)

Hi everybody,

Could you please have me a clue to check a kind of distribution of a sample data set by JSL (Ex: check to see if a sample data has normal distribution or not?

Thanks.

- Tags:
- Check
- distribution

2 ACCEPTED SOLUTIONS

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Dec 28, 2016 6:10 AM
(5931 views)

Here is the example from:

Help==>Scripting Index==>Distribution==>Continuous Distribution==>All

```
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/Cities.jmp" );
obj = Distribution( Column( :CO ) );
obj << Fit Distribution( All( 1 ) );
```

Jim

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Dec 28, 2016 6:14 AM
(5929 views)

I assume by your question that the user is not directly involved (interactive assessment) but instead a hypothesis test is desired. I would employ the Distribution platform. Launch it with the data column to be tested in the Y role. Fit the normal distribution and obtain the results of the goodness of fit test. Illustrated with the weight variable in the sample data table Big Class:

```
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
dist = dt << Distribution(
Y( :weight ),
Fit Distribution( Normal( Goodness of Fit( 1 ) ) )
);
dist rep = dist << Report;
p value = dist rep["Goodness-of-Fit Test"][NumberColBox("Prob<W")] << Get( 1 );
```

Hope answer helps.

Learn it once, use it forever!

2 REPLIES

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Dec 28, 2016 6:10 AM
(5932 views)

Here is the example from:

Help==>Scripting Index==>Distribution==>Continuous Distribution==>All

```
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/Cities.jmp" );
obj = Distribution( Column( :CO ) );
obj << Fit Distribution( All( 1 ) );
```

Jim

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Dec 28, 2016 6:14 AM
(5930 views)

I assume by your question that the user is not directly involved (interactive assessment) but instead a hypothesis test is desired. I would employ the Distribution platform. Launch it with the data column to be tested in the Y role. Fit the normal distribution and obtain the results of the goodness of fit test. Illustrated with the weight variable in the sample data table Big Class:

```
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
dist = dt << Distribution(
Y( :weight ),
Fit Distribution( Normal( Goodness of Fit( 1 ) ) )
);
dist rep = dist << Report;
p value = dist rep["Goodness-of-Fit Test"][NumberColBox("Prob<W")] << Get( 1 );
```

Hope answer helps.

Learn it once, use it forever!