Class weight score, calculation

The advantage of these systems is the possibility of estimating the weight score for each hazard class to indicate the quantitative importance (weight) of the toxicity in that class. The class weight score is calculated according to the following equation ... 

The percentage value of the class weight score is calculated in the following way ... 

The class weight score and the percentage class weight score are calculated following the scoring method on natural waters. The hazard classification system for wastes discharged into the aquatic environment is ... 

Table 8. Score allocation based on the toxic effect of each core battery bioassay for class weight calculation [HAS 2J.

Waters are ranked into one of five classes on the basis of the highest toxic response shown by at least one of the tests applied. After determination of the percentage effect (PE) obtained with each of the microbiotests, a weight score is calculated for each hazard class to indicate the quantitative importance (weight) of the toxicity in that class. This weight score is expressed as a percentage and ranges from 25% (only one test in the battery has reached the toxicity level of that class) to 93% (all tests but one have reached the toxicity level of that class). 

The continuity score measures activity-weighted structural diversity within a class of active compounds to generate the continuity score first, the following quantity is calculated as... 

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