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- boundaries and coefficients of the polynomials,
- time of observation,
- observed Y and estimated Y data,
- difference between observed and estimated Y,
- relative estimation error in percent,
- standard error of estimate per interval of X,
- overall standard error of estimate.
The standard error of estimate is estimated by:
Validation of relation curve
To investigate shifts in the relationship between two series caused by natural or human factors, like changes in cross-sections, or shifts in gauge zero's, changes in gauge locations, etc. the relation curve developed for a particular period of time is compared with data of a following period.
hymosprovides for this type of analysis the following options: - The X-Y data and relation curve parameters are both read from the data base;
- The X-Y data are read from the database and the relation curve parameters are entered manually.
Next by visual inspection the validity of the relation equation is judged.