Examples
Examples
Try the starting example
- Species abundance counts
- 10,5,3,2
- Rarefaction individual sample sizes
- 1,5,10,20
- Sample size and expected species richness
- [[1,1],[5,2.8382997936],[10,3.64163545433],[20,4]]
Try another scenario
- Species abundance counts
- [10, 5, 3, 2]
- Rarefaction individual sample sizes
- [2, 6, 12, 18]
- Sample size and expected species richness
- [[2,1.68947368421],[6,3.06720846233],[12,3.79989680083],[18,3.99473684211]]
Calculation method
Calculation method
Sample size and expected species richness
Sum_i[1−C(N−ni,m)/C(N,m)]; sampling without replacement.
Symbols and units
- a
- Species abundance counts
- b
- Rarefaction individual sample sizes
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Species counts, subsample sizes. Returns Expected richness curve. All coefficients and observations are user supplied; results describe only the stated mathematical model. Quantities are deterministic calculations from supplied observations and assumptions; no external data is fetched. Supported limits: Finite inputs only; numeric fields bounded as labelled. Lists and JSON records are limited to 256 entries unless a stricter tool bound is stated. No automatic design approval, legal conclusion, treatment recommendation or safety certification. Species abundance counts: minimum 0, maximum 1000000. Rarefaction individual sample sizes: minimum 0, maximum 1000000.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
Background reading; this does not imply endorsement or independent review of SumFizz.