AI-generated Key Takeaways
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          PivotTableSummarizeFunction is an enumeration of functions that summarize pivot table data. 
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          To call an enum, you use its parent class, name, and property, like SpreadsheetApp.PivotTableSummarizeFunction.CUSTOM.
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          The enumeration includes properties for various common summary functions such as SUM, AVERAGE, COUNT, and MAX. 
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          There is also a CUSTOMproperty valid for calculated fields.
An enumeration of functions that summarize pivot table data.
To call an enum, you call its parent class, name, and property. For example, 
SpreadsheetApp.PivotTableSummarizeFunction.CUSTOM.
Properties
| Property | Type | Description | 
|---|---|---|
| CUSTOM | Enum | A custom function, this value is only valid for calculated fields. | 
| SUM | Enum | The SUM function | 
| COUNTA | Enum | The COUNTA function | 
| COUNT | Enum | The COUNT function | 
| COUNTUNIQUE | Enum | The COUNTUNIQUE function | 
| AVERAGE | Enum | The AVERAGE function | 
| MAX | Enum | The MAX function | 
| MIN | Enum | The MIN function | 
| MEDIAN | Enum | The MEDIAN function | 
| PRODUCT | Enum | The PRODUCT function | 
| STDEV | Enum | The STDEV function | 
| STDEVP | Enum | The STDEVP function | 
| VAR | Enum | The VAR function | 
| VARP | Enum | The VARP function |