Document ID: chunk:federal_register_of_legislation:F2021L01696:clause:2_24
Version: federal_register_of_legislation:F2021L01696
Segment Type: clause
Provision Reference: sch 2 cl 24
Character Range: 202367–204014

24  Extrapolated estimate of the sampling variance of mean carbon stocks in the CEA
  Work out the extrapolated estimate of the sampling variance of mean carbon stocks in the CEA (the , in (tonnes of soil organic carbon per hectare)2, using the following equation:

  equation 87

  where:
   is the mean bias-adjusted modelled soil organic carbon stock for the CEA, worked out using equation 86, in tonnes of soil organic carbon per hectare.
   is the fraction of sampling variance given by the Supplement for validated model carbon stock estimate for the estimation event, in tonnes of soil organic carbon per hectare.
   is the discount factor for sampling variance given by the Supplement for the validated model carbon stock estimate for the estimation event.
   is the correlation coefficient given by the Supplement for the validated model carbon stock estimate for the estimation event.
Note:  The fraction of sampling variance and the correlation coefficient are not sourced from the following Subdivision but rather from other CEAs (where model-validation sampling has occurred) in accordance with the Supplement
The discount factor for sampling variance provides an estimate of model variance for a CEA where model-validation sampling has not occurred based on the variance of the model for the CEA which was model-validation sampled for the estimation event. This ensures the calculation of the creditable change in soil organic carbon stock for a CEA where model-validation sampling has not occurred under Division 5 is conservative. The impact of the discount reduces to 0 as the coefficient of determination increases towards one.