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When entering data, simply leave a blank spot for any value that is missing. Excluded values are treated exactly the same as missing values.  

Prism never ever treats an empty cell as if you had entered zero -- it always knows that is a missing value. It will analyze the data if it can, and leave analysis results blank when it cannot. Similarly, it never treats a zero as a missing value.

The details of how Prism handles missing values differs for various statistical tests.

 

 

 

 

 

 

 

 

 

 

 

 

 

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