Data Values
Using the Values column of the Types tab, you can read values automatically from the data, or you can specify measurement levels and values in a separate dialog box.
The options available from the Values drop-down list provide instructions for auto-typing, as shown in the following table.
| Option | Function |
|---|---|
| <Read> | Data is read when the node is executed. |
| <Read+> | Data is read and appended to the current data (if any exist). |
| <Pass> | No data is read. |
| <Current> | Keep current data values. |
| Specify... | A separate dialog box opens for you to specify values and measurement level options. |
Executing a Type node or clicking Read Values auto-types and reads values from your data source based on your selection. These values can also be specified manually using the Specify option or by double-clicking a cell in the Field column.
After you make changes for fields in the Type node, you can reset value information using the following buttons on the dialog box toolbar:
- Using the Clear All Values button, you can clear changes to field values made in this node (non-inherited values) and reread values from upstream operations. This option is useful for resetting changes that you may have made for specific fields upstream.
- Using the Clear Values button, you can reset values for all fields read into the node. This option effectively sets the Values column to Read for all fields. This option is useful to reset values for all fields and reread values and measurement levels from upstream operations.
Grey text in the Values column
Within either a Type node, or a Source node, if the data in the Values column is shown in black text, it indicates that the values of that field have been read and are stored within that node. If no black text is present in this field, the values of that field have not been read and are determined further upstream.
There are occasions when you can see the data as gray text. This occurs when SPSS® Modeler can identify or infer the valid values of a field without actually reading and storing the data. This is likely to occur if you use one of the following nodes:
- User Input node. Because the data is defined within the node, the range of values for a field is always known, even if the values have not been stored in the node.
- Statistics File source node. If there is metadata present for the data types it enables SPSS Modeler to infer the possible range of values without reading or storing the data.
In either node, the values are shown in gray text until you click Read Values.