The Error of Estimate of the Blood Cell Count as Made With the Hemocytometer

Proceedings of the Physiological Society

“…Red cell counts were made using a Thomatype counting chamber and pipettes, counts being made in duplicate on specimens from each of two pipettes. The probable coefficient of variation of the count thus obtained was calculated from the formula of Berkson, Magath & Hurn (1939) Continuing the search for information about the role of relaxin as a hormone of pregnancy, mice (in which gestation does not survive removal of the ovaries) were ovariectomized on the 14th or 15th day of the first pregnancy, and subsequently injected daily with progesterone alone or in combination with oestradiol and/or relaxin, no injections being given after parturition. Relaxin extracts prepared from pregnant rabbit serum and from sow corpora lutea were used.…”

On the Use of Sampling in the Field of Public Health

“…The different strata are also represented in the same proportions, so that the sample has a good distribution on all three factors introduced into the stratification. 6. In this kind of study it is often advisable to obtain data about all patients in each institution that falls in the sample.…”

Studies on Adrenocortical Eosinopenia: A Clinical and Statistical Evaluation of Four-Hour Eosinophil Response Tests 12

“…The observed standard deviations were also compared with a theoretical curve for one standard deviation of counts which was derived from the formulae of Berkson, Magath, and Hurn (24). By inspection of the data it can be seen that the observations are not equally distributed above and below the theoretical curve, the observed standard deviations being generally less than predicted, 5Berkson, Magath, and Hum (24) have pointed out the unconscious tendency towards faulty chamber counting by technicians and physicians.…”