Petney, T.N.Van Ark, H.Spickett, Arthur M.Verwoerd, Daniel Wynand2014-09-012014-09-0120131990Petney, TN, Van Ark, H & Spickett, AM 1990, 'On sampling tick populations : the problem of overdispersion’, Onderstepoort Journal of Veterinary Research, vol. 57, no. 2, pp. 123-127.0330-2465http://hdl.handle.net/2263/41858The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.Data collected on both free-living and parasitic tick populations are likely to be overdispersed. The use of means from few replicate samples of overdispersed data as quantitative estimators of tick population density is in turn likely to lead to inaccurate interpretations which may be scientifically misleading. In this paper ways of estimating overdispersion are listed and suggestions for the use of correct statistical tests for handling overdispersed data are given.en©South Africa. Dept. of Agricultural Technical Services. ©University of Pretoria. Dept. of Library Services (digital).Veterinary medicineVeterinary medicine -- South AfricaArticle