Abstract
The precision of the counting of mould spores was investigated because the precision found experimentally in a former investigation was higher than expected for the counting of randomly distributed spores. The major source of variation was due to the presence of spore aggregates, but uneven distribution of spores on the filter also contributed to a variance greater than that expected for Poisson distributed counts. A formula was obtained for the estimation of the counting precision of spore counts containing aggregates. The counting precision estimated by this formula was in agreement with that found in the former investigation.
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