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## Analysing model results

Figure 2.23: Analysis Menu

After having calculated the results of a model GREAT-ER provides you with various options to analyse the data: As GREAT-ER results are frequency distributions of concentrations for river stretches you have the option to calculate percentiles. Additionally the menu provides you with features to modify the presentation of results: either by classification or a colour coded combination of concentrations with flows. Since GREAT-ER was designed as a tool in the process of risk assessment, the main items of the analysis are the functions to calculate PEC values (Predicted Environmental Concentration).

Please note that the GREAT-ER analysis tools are designed to analyse distributions of values. Either it is possible to run a simulation with one Monte-Carlo shot probably the analysis functions will fail applied to this simualtion results.

- PEC Calculations
  - PEC initial
  - PEC catchment