Examples
Examples
Try the starting example
- Observation years
- 2000,2005,2010,2015
- Shoreline positions along fixed transect (m)
- 0,-4,-11,-14
- Observed linear movement rate (m/year)
- -0.98
- Slope standard error (m/year)
- 0.103923
- R squared
- 0.978004
Try another scenario
- Observation years
- [2000, 2005, 2010, 2015]
- Shoreline positions along fixed transect (m)
- [0, -5, -10, -15]
- Observed linear movement rate (m/year)
- -1
- Slope standard error (m/year)
- 0
- R squared
- 1
Calculation method
Calculation method
Observed linear movement rate (m/year)
Ordinary least squares position versus year; positive advances in supplied axis direction.
Slope standard error (m/year)
sqrt(residual SSE/(N−2)/sum((year−mean)²)), not total georeferencing uncertainty.
R squared
1−residual SSE/total position sum squares.
Symbols and units
- a
- Observation years
- b
- Shoreline positions along fixed transect (m)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Calculation steps and notation
sum(list) adds all entries in the list.
Assumptions & limits
Assumptions & limits
- Dated shoreline positions, transects, regression. Returns Observed retreat-advance rates and uncertainty. 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. Observation years: minimum None, maximum 1000000000000.0. Shoreline positions along fixed transect (m): minimum None, maximum 1000000000000.0.
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.