Analysis and modelling of the COLOSS international data set 2010-2011

Gray, Alison; (2012) Analysis and modelling of the COLOSS international data set 2010-2011. In: Proceedings of the COLOSS WG1 workshop on modelling and standardization. Netherlands Centre for Bee Research, Tersoal Netherlands.

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Abstract

Colony Losses have been calculated for Netherlands, Germany, Poland, Hungary, Austria, Denmark, Ireland and the UK. The following approach was used. Initial analysis was conducted using examination of the data and descriptive statistics. Some inconsistencies in the data were found, for further consideration. Using appropriate selection of cases, colony losses were calculated for the countries above individually and also overall, using overall proportion of loss, CDS type loss and loss due to queen problems, and also the mean/median of the individual loss rates per beekeeper. The proportions of beekeepers suffering any loss of any kind were also calculated. We both included and excluded Scotland as part of the UK. Differences between countries were found based on 95% confidence intervals for proportion of losses. Some suggestions are made in relation to data quality control and data modelling. Logistic regression/binomial-logit generalised linear modelling may be used to model the chance of any loss, any CDS loss, or loss due to queen problems.

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