What is the process of creating a variable in SPSS that tracks the number of cases with identical IDs?

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The process of creating such a variable in SPSS involves the following steps:

1. Open the dataset in SPSS.
2. Click on the "Transform" menu and select "Compute Variable" option.
3. In the "Target Variable" field, give a name to the new variable (e.g. "Num_IDs").
4. In the "Numeric Expression" field, type the following formula: N = COUNT(ID).
5. Click on the "OK" button to create the variable.
6. Save the dataset with the new variable included.

Note that "ID" refers to the variable that contains the identification numbers, and "Num_IDs" is the new variable that will track the number of cases with identical IDs. The "COUNT" function counts the number of cases with the same ID value. By creating this variable, you can easily identify cases with duplicate IDs and analyze them accordingly.