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SAMPLE SORTING AND IDENTIFICATION ERRORS
Results derived from Furse et al (1995) analyses of sample audit data:
Bias = Net underestimation of number of taxa in the sample
= Net "gains"estimated from a quality control procedure or audit scheme
Assume a Poisson distribution for the sample bias
Poisson distributbn of sample
biases when average bias is 2.0
Need to specify B1, B2 and B3, the average biases for each of
spring, summer and autumn single season samples
Average bias for a two seasons combined sample
51% (sum of the biases in the two individuals seasons)
Average bias for a three seasons combined sample
37% (sum of the biases in the three individuals seasons)