Document ID: chunk:federal_register_of_legislation:F2021L01696:clause:2_20
Version: federal_register_of_legislation:F2021L01696
Segment Type: clause
Provision Reference: sch 2 cl 20
Character Range: 195534–197134

20  Degrees of freedom for the sampling variance of the mean soil organic carbon stock within a CEA
 (1) Where individual or within-strata composite samples were used for the estimation event, work out the degrees of freedom ( to use in equation 115 for a given estimation event, using the following equation:
  equation 81

where:
 is an identifier for the stratum.
H is the number of strata for the CEA.
 is the relative area of the CEA covered by stratum h in the CEA, expressed as a proportion of the total CEA area.
 is the sampling variance of the mean soil organic carbon for each stratum h in the CEA in (tonnes of soil organic carbon per hectare)2, worked out using equation 79.
   is the number of relevant  samples collected from the stratum h (either within-strata composites samples or individual samples as appropriate).
Note 1: Equation 81 is a simplified equation using the condition that  The original version of the equation is:
Note 2: Where a CEA contains three strata, equation 81 written in its expanded form, where the subscripts 1, 2, and 3 are used to denote values for stratum 1, stratum 2, and stratum 3, respectively takes the following form:
 (2)  Where across-strata composite samples were collected across equal area strata, work out the degrees of freedom ( to use in equation 115 for a given estimation event, using the following equation:
  equation 82

where:
 is the number of relevant across-strata composite samples collected from CEA.
Subdivision 3—Model-only soil organic carbon stock estimation and its sampling variance for the CEA for each estimation event