1938

最新文章

• Applicability of the z test to a poisson distribution AI翻译
  作者：Chapman, RA
  摘要：100 samples of 16 values were drawn experimentally from a Poisson distribution with mean equal to 1. Each sample of 16 was divided into 4 equal subsets. For each sample 2 estimates of the variance of the population were computed, i.e., variance between means of subsets and variance within subsets. The distr. of the ratio of these 2 variances, or F, was compared with the theoretical distr. Agreement between actual and theoretical frequency of F, as measured by x2, was satisfactory. P(x2) was ab...
• The probability integral transformation for testing goodness of fit and combining independent tests of significance AI翻译
  作者：Pearson, ES
  摘要：This paper draws attention to the somewhat novel character of the problem to be faced in dealing with statistical tests based on the probability integral transformation (see work of R. A. Fisher, Karl Pearson and J. Neyman). The intuitional notions that have often served to determine the most appropriate test when dealing with normal variation are hardly applicable when, as in this case, we are concerned with a transformed variable following the rectangular distribution. The tests proposed by ...
• Rural mortality - Its comparative sex incidence AI翻译
  作者：Martin, WJ; Cheeseman, EA
  摘要：The relatively higher mortality among [female][female] than among [male][male] in the rural districts, using the mortality rate of England and Wales as a whole as a standard, has been examined for the 2 triennia, 1920-2 and 1930-2, by geographical divisions, age and cause of death. The ratio of Expected/Actual deaths is greater among [female][female] for all geographical divisions and all ages over 15. The causes of death which contributed largely to this phenomenon seemed to be phthisis and c...
• A note on a form of Tchebycheff's Theorem for two variables AI翻译
  作者：Berge, PO
  摘要：This paper shows that if 2 variables x and y have means at zero, standard deviations
• Gauss' quadratic formula with twelve ordinates AI翻译
  作者：Bayly, BEF
  摘要：The author gives the numerical values to 13 decimal places of the constants of Gauss'' quadratic formula based on 12 ordinates.
• Indian races in the United States a survey of previously published cranial measurements AI翻译
  作者：Von Bonin, G; Morant, GM
  摘要：Measurements of 1167 undeformed o* skulls divided into 16 series are analyzed. Judging from standard deviations given, all these series represent populations which show a remarkably close approach to equality in variation, and 2 others are rejected because they represent groups which are decidedly more heterogeneous. The results of comparisons of the mean measurements tested by the method of the coefficient of racial likeness are given; there is a surprising diversity among the Indian types of...
• Absence and recovery recorded at irregular intervals, illustrated on school data AI翻译
  作者：Sandon, F
  摘要：Absenteeism recorded at 10 epochs in a weekly cycle in a day secondary school over a period of some 250,000 pupil-sessions at risk is used to obtain the Sickness Recovery Curve of the adolescent population (boys and girls) concerned. 2/3 of the children are fit within a day. By reversing the process the expected absences are detd. and some tendencies needing administrative attention noted. The method of utilizing the data is appropriate for any community recording absences in a comparable fash...