Ranking Methodology
How we calculate supplier rankings using objective laboratory data.
Scoring Algorithm
Our ranking algorithm uses a weighted composite score based on six key metrics. Each supplier receives a score from 0-100 based on their performance across all metrics.
Quality Score
25%Based on average purity percentage from lab tests. Higher purity = higher score.
Volume Score
20%Based on total number of certificates submitted. More testing = more data = higher confidence.
Accuracy Score
20%Measures how closely the stated quantity matches the tested quantity. Higher accuracy = higher score.
Consistency Score
15%Based on standard deviation of purity results. Lower variance = higher consistency = higher score.
Recency Score
10%Recent tests are weighted higher than older ones. Active suppliers score better.
Testing Completeness
10%Suppliers who test for multiple parameters (purity, quantity, endotoxin) score higher.
Data Requirements
To appear in rankings, suppliers must meet minimum criteria:
- At least 5 laboratory certificates from Janoshik Janoshik
- Publicly available test results
- Complete information (purity and quantity data)
How Scores Are Calculated
Each metric is normalized to a 0-100 scale using percentile ranking among all suppliers. The final score is a weighted average of all six components.
For example, a supplier in the 90th percentile for purity would receive a quality score of 90, while a supplier in the 50th percentile would receive 50.
The weighted sum is calculated as: (Quality × 0.25) + (Volume × 0.20) + (Accuracy × 0.20) + (Consistency × 0.15) + (Recency × 0.10) + (Completeness × 0.10)
Automatic Updates
Rankings are updated automatically as new certificates are published on the Janoshik public website. There is no manual intervention - all updates happen through automated data collection and processing.
Certificate Data Collected
- Peptide name and specification
- Purity percentage (HPLC analysis)
- Stated vs tested quantity
- Endotoxin levels (where available)
- Test date