Journal of the American Statistical Association

最新文章

• A FREQUENCY DISTRIBUTION REPRESENTED AS THE SUM OF 2 POISSON DISTRIBUTIONS AI翻译
  作者：SCHILLING, W
  摘要：When an empirical distr. of objects or events appears theoretically likely to conform to a Poisson distr. but exhibits frequencies significantly different from the theoretical, one very simple alternative hypothesis is that the distr. consists of the sum of 2 Poissons. It is considered that n1 events out of a total frequency n were distributed in the Poisson manner with mean a1 and that the remaining n 2 events were distributed according to another Poisson with mean [alpha] 2. The general term...
• A STRATIFIED-RANDOM SAMPLE OF A SMALL FINITE POPULATION AI翻译
  作者：CORNELL, FG
• THE PROBLEM OF PLOT SIZE IN LARGE-SCALE YIELD SURVEYS AI翻译
  作者：SUKHATME, PV
  摘要：For estimating crop yield from the yield of sample plots, large plots of 0.01 acres or more are used in some regions and very small plots of 0.0003 acres or less are employed in other regions. Three empirical comparisons of large and small plots in India suggest that the results from small plots are biased and tend to overestimate average yield. The bias evidently arises from uneven sowing and the inability of the sample-collectors to decide which of the plants on the borders of plots should b...
• COST-UTILITY AS A MEASURE OF THE EFFICIENCY OF A TEST AI翻译
  作者：BERKSON, J
  摘要：Testing procedures for separating populations into 2 mutually exclu-sive categories must be judged in terms of 2 numbers rather than a single index. A test has utility or sensitivity in proportion to its efficiency for correctly selecting from the population all members of category A. The cost or specificity of a test is proportional to its yield of false-positive results; non-A individuals classified as A. For normally distributed test scores a mean-cost-rating index (M.C.R.) may be derived, ...
• AGRICULATURAL PRICE INDEX NUMBERS AI翻译
  作者：PETERSON, AG
• THE USE OF THE ANGULAR TRANSFORMATION IN BIOLOGICAL ASSAYS AI翻译
  作者：KNUDSEN, LF; CURTIS, JM
  摘要：For biological assays designed to compare a sample of unknown potency with a standard in terms of % response, the angular transformation is advocated as giving essentially the same results as the probit transformation but requiring much less computation. Several modifications of assay design permit further simplification. By using the same number of animals for each dose, only 2 dosage levels each of standard and unknown, and a constant ratio of high dose to low dose, results may be so simplif...
• USE OF VARIANCE COMPONENTS IN THE ANALYSIS OF HOG PRICES IN 2 MARKETS AI翻译
  作者：ANDERSON, RL
• GENERAL METHODS OF ANALYSIS FOR INCOMPLETE BLOCK DESIGNS AI翻译
  作者：RAO, CR
  摘要：The author considers all exptl. designs as special cases of 2 fundamental designs, a generalized partially balanced incomplete block design and an intra and intergroup-balanced incomplete block design which is illustrated by an example. A few formulae appropriate to analysis of these 2 types should then serve all exptl. data. When eventually a Dictionary of Designs becomes available experimenters may be able routinely to select the design most appropriate for their purposes.
• COORDINATING THE MEASUREMENTS OF RADIO LISTENING AI翻译
  作者：ZEISEL, H
• SIMPLIFIED METHODS OF FITTING CERTAIN TYPES OF GROWTH CURVES AI翻译
  作者：COWDEN, DJ
  摘要：A method using 3 selected points and a graphic method are described for fitting a modified exponential curve. y = k + abx; the Gompertz curve, y = kAbx; and the Logistic, [image]. The graphic method consists of obtaining a trial value for the upper asymptotic value k, plotting a curve on semi-log, paper and adjusting k by iteration to obtain a straight line trend. For the Logistic this method is less laborious than Pearl''s method only when the lower asymptote is zero.