The sample project contains several data sets and sample modeler flows. If you don't already have the sample project, then refer to the Tutorials topic to create the sample project. Then follow these steps to open the sample project:

1. In watsonx, from the Navigation menu , choose Projects > View all Projects.
2. Click SPSS Modeler Project.
3. Click the Assets tab to see the data sets and modeler flows.

Check your progress

The following image shows the project Assets tab. You are now ready to work with the sample modeler flow associated with this tutorial.

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Reducing Input Data String Length includes several nodes. Follow these steps to examine the Data Asset and Type node:

1. From the Assets tab, open the Reducing Input Data String Length modeler flow, and wait for the canvas to load.
2. Double-click the drug_long_name.csv node. This node is a Data Asset node that points to the drug_long_name.csv file in the project.
3. Review the File format properties.
4. Optional: Click Preview data to see the full data set.
5. Double-click the Type node after the Data Asset node. This node specifies field properties, such as measurement level (the type of data that the field contains), and the role of each field as a target or input in modeling. The measurement level is a category that indicates the type of data in the field. The source data file uses three different measurement levels:
   • A Continuous field (such as the Age field) contains continuous numeric values.
   • A Nominal field (such as the Drug field) has two or more distinct values; in this case, drugA or drugB.
   • A Flag field (such as the Sex field) describes data with multiple distinct values that have an inherent order; in this case, F, and M.

   

   For each field, the Type node also specifies a role to indicate the part that each field plays in modeling. The Role is set to Target for the field Cholesterol_long, which is the field that indicates whether a customer has Normal or High level of cholesterol. The target is the field for which you want to predict the value.

   Role is set to Input for the other fields. Input fields are sometimes known as predictors, or fields whose values are used by the modeling algorithm to predict the value of the target field.

6. Optional: Click Preview data to see the filtered data set.

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The following image shows the Type node. You are now ready to view the Logistic node.

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In this task, you run the model and discover an error, Follow these steps to reclassify the values to avoid the error:

1. From the Modeling section in the palette, drag the Logistic node onto the canvas and connect it to the existing Type node after the Data Asset node.
2. Double-click the Cholesterol_long node to see its properties.
3. Select the Binomial procedure (instead of the default Multinomial procedure).
   • A Binomial model is used when the target field is a flag or nominal field with two discrete values.
   • A Multinomial model is used when the target field is a nominal field with more than two values.
4. Click Save.
5. Hover over the Cholesterol_long node, and click the Run icon . An error message warns you that the Cholesterol_long string values are too long. You can use a Reclassify node to transform the values to fix this issue. Reclassify node is useful for collapsing categories or regrouping data for analysis.

   

6. Double-click the Cholesterol (Reclassify) node to see its properties. Notice that the Reclassify Field is set to Cholesterol_long and the New Field Name is Cholesterol.
7. Click Get values and then expand the Automatically Reclassify section. Add the Cholesterol_long values to the original value column.
8. In the new value column, for the High level of cholesterol original value, type High and for the Normal level of cholesterol original value, type Normal. These settings shorten the values to avoid the error message.

Check your progress

The following image shows the Reclassify node. You are now ready to check the Filter node.

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Follow these steps to see and check the Filter node:

1. Double-click the Filter node to see its properties.
2. Notice that this node filters out the Cholesterol_long field.

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The following image shows the Filter node. You are now ready to define the target.

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You can specify field properties in a Type node. Follow these steps to define the target in the Type node:

1. Double-click the Type node after the Filter node to view its properties.
2. Click Read values to read the values from your data source and set the field measurement types. The Role tells modeling nodes whether fields are Input (predictor fields) or Target (predicted fields) for a machine-learning process. Both and None are also available roles, along with Partition, which indicates a field that is used to partition records into separate samples for training, testing, and validation. The value Split specifies that separate models are built for each possible value of the field.
3. For the Cholesterol field, set the role to Target.
4. Click Save.

Check your progress

The following image shows the Type node. You are now ready to generate the model.

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Follow these steps to view the model output in table format:

1. Hover over the Cholesterol (Logistic) node, and click the Run icon .
2. From the Outputs section in the palette, drag the Table node onto the canvas, and connect it to the model nugget.
3. Hover over the Table node that is connected to the Cholesterol model, and click the Run icon .
4. In the Outputs and models pane, click the output results with the name Table to view the table output.

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The following image shows the model output.

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