Confidence Rating of Marine Eutrophication Assessments Ciarán Murray, DHI CONFIRM Workshop, Copenhagen 6 th March 2009

Confidence Rating Based on scoring of indicators RefCon, AcDev, and AcStat, are scored with respect to: extraordinary quality acceptable quality ‘indicator confidence’ poor quality ‘Indicator confidence’ is combined per quality element Quality elements are combined into a interim ’confidence assessment’: Class I = % = extraordinary quality Class II = 75-50% = acceptable quality Class III = 50-0% = poor quality

Scoring an Indicator

Indicator Confidence From scores to indicator confidence rating

Quality Element Confidence From Indicator to Quality Element confidence rating …including Indicator weighting

Overall Confidence Assessment Confidence for Quality Elements combined To give overall assessment Class I = % = extraordinary quality Class II = 75-50% = acceptable quality Class III = 50-0% = poor quality

Overall Confidence Assessment Another example… Class I = % = extraordinary quality Class II = 75-50% = acceptable quality Class III = 50-0% = poor quality

Only 1 indicator? A quality element with only 1 indicator has a reduced confidence rating. Reduction -25%

Only 1 Quality Element With only 1 quality element the overall confidence rating is reduced. Reduction -50%

Confidence Rating …any questions? Reference Conditions (RefCon) Confidence Score Indicator Confidence Rating (Ind_Conf) Actual Status (AcStat) Confidence Score Acceptable Deviation (AcDev) Confidence Score Quality Element Confidence Rating (QE_Conf) Final Confidence Rating