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# measureMasterIdentifier()

- Package: [@gooddata/sdk-model](https://www.gooddata.ai/docs/gooddata-ui/latest/api-reference/sdk-model/index.md)
- Kind: function
- Source: https://github.com/gooddata/gooddata-ui-sdk/blob/rel/11.64/libs/sdk-model/src/execution/measure/index.ts

Gets identifier of master measure for the provided PoP measure or Previous Period measure.

**Signature:**

```typescript
export declare function measureMasterIdentifier(measure: IMeasure<IPoPMeasureDefinition | IPreviousPeriodMeasureDefinition>): string;
```

## Parameters

| Parameter | Type | Description |
| --- | --- | --- |
| measure | [IMeasure](https://www.gooddata.ai/docs/gooddata-ui/latest/api-reference/sdk-model/sdk-model.imeasure/index.md)&lt;[IPoPMeasureDefinition](https://www.gooddata.ai/docs/gooddata-ui/latest/api-reference/sdk-model/sdk-model.ipopmeasuredefinition/index.md) \| [IPreviousPeriodMeasureDefinition](https://www.gooddata.ai/docs/gooddata-ui/latest/api-reference/sdk-model/sdk-model.ipreviousperiodmeasuredefinition/index.md)&gt; | derived measure |

**Returns:**

string

master measure identifier