Where two laboratories tested the same retail lot, the paired difference is a clean estimate of inter-lab bias with no selection term in it at all. Those pairs are the backbone of the agreement analysis.
bland_altman
Paired agreement analysis. Limits of agreement over correlation coefficients.
Section 1
Contribution
Both submits records and annotates other people's.
Records submitted
4
n=4
Annotations
89
n=89
Median purity submitted
98.50%
n=4
Suppliers covered
4
n=4
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.
| Report | Compound | Supplier | Lot | Lab | Quarter | Purity % | Water % | Recovery % | Provenance | Flags | Result |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AX-2026-043432 | L-Glutathione (reduced) | WXT | WXT-2605-B3833 | Janoshik | 2026-Q3 | 97.52 | 6.08 | — | Buyer-sourced | 0 | FAIL |
| AX-2026-042148 | Cagrilintide | JEEP | JEEP-2603-E9024 | Janoshik | 2026-Q2 | 98.66 | 6.33 | — | Buyer-sourced | 0 | PASS |
| AX-2025-019112 | Retatrutide | GSP | GSP-2411-B2857 | Nordanalyt | 2025-Q2 | 98.34 | 7.67 | 94.6 | Buyer-sourced | 0 | PASS |
| AX-2024-005129 | Tirzepatide | SGN | SGN-2411-N9012 | Nordanalyt | 2024-Q4 | 98.69 | 3.42 | 102.1 | Buyer-sourced | 0 | PASS |
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.
The offset between a short method and the reference is estimable wherever both tested the same lot. Those pairs exist and the estimate is published with its limits of agreement.
Agreement analysis needs paired observations and this lot supplies none. The pairs that exist elsewhere are what the laboratory bias estimates rest on.
Reading the record the same way.
Paired differences on one lot estimate inter-lab bias with no material term in them. Lots like this one are the backbone of the agreement analysis on this site.
Showing 5 distinct comments of 89 annotations by this handle.