Distance Transformation

Transforms distances in a data set.

Signals

Inputs:

• Distances

  A distance matrix

Outputs:

• Distances

  A distance matrix

Description

The Distances Transformation widget is used for the normalization and inversion of distance matrices. The normalization of data is necessary to bring all the variables into proportion with one another.

1. Choose the type of Normalization:
   • No normalization
   • To interval [0, 1]
   • To interval [-1, 1]
   • Sigmoid function: 1/(1+exp(-X))
2. Choose the type of Inversion:
   • No inversion
   • -X
   • 1 - X
   • max(X) - X
   • 1/X
3. Produce a report.
4. After changing the settings, you need to click Apply to commit changes to other widgets. Alternatively, tick Apply automatically.

Example

In the snapshot below, you can see how transformation affects the distance matrix. We loaded the Iris data set and calculated the distances between rows with the help of the Distances widget. In order to demonstrate how Distance Transformation affects the Distance Matrix, we created the worflow below and compared the transformed distance matrix with the “original” one.