Adding a note that I have seen this pattern before and had nothing to add at the time.
Contributor #A-7284
Anonymous submitter. Paired lab comparisons on single lots.
Section 1
Contribution
Both submits records and annotates other people's.
Records submitted
13
n=13
Annotations
1
n=1
Median purity submitted
98.88%
n=13
Suppliers covered
11
n=13
Section 2
Records submitted
A submitter chose to buy this material and to pay for this assay. That choice is the selection mechanism behind the whole index and it is not random.
Section 3
Annotations
Signed technical comments on records. The index does not moderate annotations for agreement with its own arithmetic, and several of these disagree with it. Where a handle has made the same point on several records, one instance is shown and the rest are reachable from the records themselves.