Box 141 OECD envionmental indicator selection criteria

In the first step we choose the reference scales for the individual indicators/sub-indices: area, population size and economic performance (GDP) to make them comparable among nations. Then, we create z-score s from all indicators' components

TMCX

tpes oe] vtpes

Where z-value (Z expresses the divergence of the TMC (EF. TPES) of country x from the most probable result jj (mean of entire set of tmc or e/'or tpes) as a number of standard deviations. The larger the value of z, the less probable the experimental result is due to chance. The probability for component {tmc, ef, tpes) and country (*) can be calculated from the cumulative standard normal distribution:

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