What might be plausible weights for the pairs of eye colour categories?
I suggest that we give disagreement weights such that minor disagreements are weighted 1 and other disagreements are weighted 2, as follows:
| black | brown | blue | grey | hazel | green | other | |
| black | 0 | 1 | 2 | 2 | 2 | 2 | 2 | 
| brown | 1 | 0 | 2 | 2 | 1 | 2 | 2 | 
| blue | 2 | 2 | 0 | 1 | 2 | 2 | 2 | 
| grey | 2 | 2 | 1 | 0 | 2 | 1 | 2 | 
| hazel | 2 | 1 | 2 | 2 | 0 | 1 | 2 | 
| green | 2 | 2 | 2 | 1 | 1 | 0 | 2 | 
| other | 2 | 2 | 2 | 2 | 2 | 2 | 0 | 
You may disagree, there is no right answer to this.
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Last updated: 21 July, 2008.