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# predicateForObjectsWithNoCorrelation()

Returns a predicate that matches all objects that are not associated with a HealthKit correlation.

```
class func predicateForObjectsWithNoCorrelation() -> NSPredicate
```

## Return Value

A predicate that matches all objects that are not associated with any HealthKit correlations.

## Discussion

Use this convenience method to create a predicate that matches all objects not associated with a [`HKCorrelation`](/documentation/HealthKit/HKCorrelation) object. The following sample uses both the convenience method and a predicate format string to create equivalent predicates.

```objc
NSPredicate *noncorrelated = [HKQuery predicateForObjectsWithNoCorrelation];
 
NSPredicate *explicitNoncorrelated =
[NSPredicate predicateWithFormat:@"%K == nil", HKPredicateKeyPathCorrelation];
```

## See Also

[`HKPredicateKeyPathCorrelation`](/documentation/HealthKit/HKPredicateKeyPathCorrelation)

The key path for accessing the object’s correlation inside a predicate format string.

[`HKCorrelation`](/documentation/HealthKit/HKCorrelation)

A sample that groups multiple related samples into a single entry.


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