Merge(?): Definition of "pValue"

**Term**: `pValue`
**Original comment**: [link](https://docs.google.com/spreadsheets/d/16pC2cDsdxlzv2CzlNMtStqt5-xHwDEsU6MjZVxWhrE4/edit?disco=AAAAAGscQFs)
**Current link**:  [nidm-results.owl/pValue](https://github.com/incf-nidash/nidm/blob/master/nidm/nidm-results/nidm-results.owl#L732-L751)

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@jbpoline  `11:07 31 Aug 2013`
uri from experimental factor ontology? (form OB) or create property - look for stat ontology like EDAM
	
@nicholsn `20:52 18 Apr`
+1 for reuse of term from OBI (http://purl.obolibrary.org/obo/OBI_0000175), or list as a synonym
	
@cmaumet `09:53 24 Apr`
+1 to re-use the OBI term.

[there were more comments not reported here about how to indicate re-use of definitions within the spreadsheet]