Physical Fractionator formulas
Total number of particles (N)
: Particles counted
: Area sampling fraction
: Section sampling fraction
Variance due to noise (s2)
: Particles counted- n: Number of sections used
Variance due to systematic random sampling (VARSRS)
- s2: Variance due to noise
Total variance (TotalVar)
- VARSRS: Variance due to SRS
- s2: Variance due to noise
Coefficient of error (CE)
- TotalVar: Total variance
- s2: Variance due to noise
References
Gundersen, Hans-Jørgen G. Stereology of arbitrary particles*. Journal of Microscopy 143, no. 1 (1986): 3-45.
Sterio, D. C. The unbiased estimation of number and sizes of arbitrary particles using the disector. Journal of Microscopy 134, no. 2 (1984): 127-136.