RAPID GRAPHICAL METHOD FOR ESTIMATING THE PRECISION OF DIRECT MICROSCOPIC COUNTING DATA.
A graphical method of estimating the 90, 95, or 99% confidence intervals of direct microscopic counting data is presented. Construction of the graphs is based on the assumption that the normal distribution approximates the Poisson distribution. The method, useful on data obtained from dried films or counting chambers, eliminates time-consuming computation of precision. The minimal number of fields which must be counted to maintain a certain level of precision can be readily determined.
D001772:Blood Cell Count; D008853:Microscopy; D016012:Poisson Distribution; D012106:Research; D013223:Statistics as Topic
BLOOD CELL COUNT; EXPERIMENTAL LAB STUDY; MICROSCOPY; STATISTICS