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Table 3 Number of traps needed to reach a certainty of 90% or 95% of excluding a false negative result when sampling one, two or three nights

From: Spatio-temporal optimization of sampling for bluetongue vectors (Culicoides) near grazing livestock

Full datasetProbability / Nights 1 2 3
90% 18 3 1
95% 25 7 2
Modified dataset*    
Probability / Nights 1 2 3
90% 2 1 1
95% 3 1 1
  1. With the modified dataset (i.e. without low catch nights), a higher probability level is reached much quicker. The modified dataset represents the data without the five catch nights with more than 90% zero-catches.