Definition of "StatisticImageProperties"

**Term**: `StatisticImageProperties`
**Definition**: "Properties of the underlying statistical process".
**Original comment**: [link](https://docs.google.com/spreadsheets/d/16pC2cDsdxlzv2CzlNMtStqt5-xHwDEsU6MjZVxWhrE4/edit?disco=AAAAAJVbYyw)
**Current link**:  [nidm-results.owl/StatisticImageProperties](https://github.com/incf-nidash/nidm/blob/master/nidm/nidm-results/nidm-results.owl#L1920-L1941)

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@cmaumet `10:22 9 Apr`
Not so sure about this one...
	
@khelm `19:49 9 Apr`
Agreed. What information is this term conveying?
	
@nicholsn `19:58 18 Apr`
Is this to provide attributes about spatial metadata like CoordinateSpace or encode provenance information about the statistics used to generate the image?
	
@khelm `19:47 23 Apr`
Yes, here is where Nolan's idea of putting into the definition some idea of what kind of thing would be stored would be a big help.
	
@cmaumet `11:53 25 Apr`
This entity has attributes: expectedNumberOfVoxelsPerCluster, expectedNumberOfClusters, heightCriticalThresholdFWE05, heightCriticalThresholdFDR05and smallestSignifClusterSizeInVoxelsFWE05 and smallestSignifClusterSizeInVoxelsFDR05 
I would say these are statistical properties but I am not sure how to formalise a definition. 

@nicholst: do you think these are characteristics of the underlying random field? If so, we could group these attributes with others such as randomFieldStationarity, reselSize...