Comparing Three or More Models

You can compare three or more algorithms to discover the best one to solve a predictive problem in all scenarios (HANA and non-HANA). However, when your analysis has three or more algorithms, you cannot add a child node to perform further fine-grained analysis.

Prerequisites: It is mandatory to use the Model Statistics and Partition components with the Model Compare component to create your model comparison chain.

Take the following steps to compare three or more algorithms:

  1. In Expert Analytics, connect to a Data Source and navigate to the Predict room.
  2. Drag-and-drop a Partition component to the analysis editor.
  3. In the Algorithms section, drag-and-drop selected three or more algorithms to the analysis editor.
  4. Add to the analysis chain the appropriate Model Statistics and Model Compare components.
  5. Drag-and-drop the Model Compare component that you added to the analysis editor over all of the Model Statistics components that you want to compare.
    Note After dragging-and-dropping the Model Compare component over the third Model Statistics component, the Model Compare will become a terminal (or leaf) component in a chain because the component has three parents. Be aware that you cannot perform further analysis on a terminal component. The component displays the following icon when comparing three or more components:
  6. Name the columns that result from the mapping for the child component to use. Optionally, you can add or remove other columns of the same type. To map all other columns, manually add the additional rows.
    Note

    The data in the mapped columns comes from the winning component. None of the columns in the configuration window can be empty.

You can now use the Partition, Model Statistics and Model Comparison components to compare three or more algorithms to solve a complex analysis.