Johnson Transformation

Johnson Transformation

Johnson transformation is located under Model Studio > Statistical Analysis > Johnson Transformation. on the left task pane. Use the drag-and-drop method (or double-click on the node) to use the algorithm in the canvas. Click the algorithm to view and select different properties for analysis.


Properties of Johnson Transformation

The following figure shows the properties of Johnson Transformation.


The table below describes the properties of Johnson's transformation.

Field

Description

Remark

Run

It allows you to run the node.

-

Explore

It allows you to explore the successfully executed node.

-

Vertical Ellipses

The available options are

  • Run till node
  • Run from node
  • Publish as a model
  • Publish code

-



Task Name


It is the name of the task selected on the workbook canvas.

You can click the text field to edit or modify the task name as required.


Feature

It allows you to select a numerical column.

Only one numerical column can be selected.


Advanced

Lambda

It allows you to enter a specific. It transforms all the values in the selected column using the entered value of lambda.

  • By default, the value is None.
  • Any positive or negative real number can be entered.

Alpha

It allows you to enter the Alpha value, a significance level.

  • The default value is 0.05. You can modify this value.
  • The Alpha value is always between 0 to 1. The value 0 interprets 100% confidence on the test. The value 1 interprets 0% confidence on the test. The system cannot guarantee both scenarios, hence the values cannot be 0 and 1.


Node Configuration

It allows you to select the instance of the AWS server to provide control over the execution of a task in a workbook or workflow.

For more details, refer to worker node configuration

Example of Johnson Transformation

We consider the credit card balance dataset. It contains numerical columns Age, balance, cards, and so on. We select the Age column for Johnson transformation.
The result of the Johnson transformation is displayed in the figure below.


The result page displays the following fields.

Section

Description

Shapiro Wilk test of normality

It shows the test statistics for the Shapiro-Wilk test for normality and tells whether Johnson's transformation is required.

Lambda

It is the value of lambda for which the distribution of data is normal after transformation.

Probability plot

It shows the QQ Plot before and after the Johnson transformation.


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