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Feb 16, 2020 6:07 AM
(540 views)

Is there a way to script the deletion of extreme outliers per column? My objective is once i run the script, it concatenates data tables, delete extreme outliers per column and display graphs but im having some sort of problem with the outlier part.

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Created:
Feb 16, 2020 7:25 AM
| Last Modified: Feb 17, 2020 8:13 AM
(529 views)
| Posted in reply to message from viskovicz00012 02-16-2020

I use Jackknife Distances for outliers.

For extreme outliers I use upper limit = 6.

In the following example I use upper limit = 2.

```
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
JackknifeObj = dt << Multivariate( Y( 4 ), Jackknife Distances( 1, Save Jackknife Distances( 1 ) ) );
JackknifeObj << Close Window();
dt << Select Where( :Jackknife Distances > 2 );
dt << Hide and Exclude << Clear Select << Delete Column( Jackknife Distances );
```

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Created:
Feb 16, 2020 7:25 AM
| Last Modified: Feb 17, 2020 8:13 AM
(530 views)
| Posted in reply to message from viskovicz00012 02-16-2020

I use Jackknife Distances for outliers.

For extreme outliers I use upper limit = 6.

In the following example I use upper limit = 2.

```
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
JackknifeObj = dt << Multivariate( Y( 4 ), Jackknife Distances( 1, Save Jackknife Distances( 1 ) ) );
JackknifeObj << Close Window();
dt << Select Where( :Jackknife Distances > 2 );
dt << Hide and Exclude << Clear Select << Delete Column( Jackknife Distances );
```

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Re: Outlier Deletion

@tom_abramov approach is a good method for identifying outliers. Are you looking for what method to use to identify outliers or do you already have a method of determining the outliers that you want to use?

Jim

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