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Tech Tip: Identifying Duplicate Cases in IBM SPSS Statistics

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Cleaning a dataset can be tricky, especially when it comes to duplicate cases. Learn how this function helps you to define duplicate cases in any way you want and flag them to be deleted or used as desired.

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Tech Tip: Identifying Duplicate Cases in IBM SPSS Statistics

  1. 1. Identifying Duplicate Cases in IBM SPSS Statistics
  2. 2. Duplicate Cases 2  On cleaning a dataset, one of your first steps should be to identify possible duplicate cases  Duplicate cases may occur for three reasons: • (1) data entry errors • (2) multiple cases that share a common primary ID value but have different secondary ID values • (3) multiple cases represent the same case but with different values for variables other than those that identify the case  The Identify Duplicate Cases feature enables you to find duplicate cases using almost any method, and allows you to decide whether to identify primary or duplicate cases
  3. 3. Identify Duplicate Cases 3  To identify and flag duplicate cases: • Select Data from the menu • Select Identify Duplicate Cases • This opens the Identify Duplicate Cases Dialog Box
  4. 4. Identify Duplicate Cases 4  Select one or more variables that identify matching cases and move them to the Define matching cases by box  Select an appropriate option in the Variables to Create section
  5. 5. Identify Duplicate Cases 5  Finally, select one or more variables to sort cases, or automatically filter the duplicate cases, so they won't be included in reports, charts, or calculations of statistics
  6. 6. www.presidion.com Talk to us  info@presidion.com +44 (0)208 757 8820 (UK) +353 (0)1 415 0234 (IRL) www.presidion.com/ibm-spss-technical-tips For more Tech Tips visit

Cleaning a dataset can be tricky, especially when it comes to duplicate cases. Learn how this function helps you to define duplicate cases in any way you want and flag them to be deleted or used as desired.

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