abstract the production unit size is one of the effective factors in optimum uses of inputs. since optimum size is affected by the characters and economical conditions in each district, the studies for determining the optimum farm size should be done specially for each crop and each district. in this study tried to determine the optimum rice farm size in guilan province which is one of the most...

A statistical model developed from scientific theory may “fail to fit” the available data if the scientific theory is incorrect or if the sample size is too small. The former point is obvious but the latter is more subtle. In the latter case, the hypothesized model may fail to fit in the sense that it is viewed as unnecessarily complicated, and so the investigators settle upon a simpler model t...

Procedures are reviewed and recommendations made for the choice of the size of a sample to estimate the characteristics (sometimes known as parameters) of a population consisting of discrete items which may belong to one and only one of a number of categories with examples drawn from forensic science. Four sampling procedures are described for binary responses, where the number of possible cate...

In experiments designed to estimate a binomial parameter, sample sizes are often calculated to ensure that the point estimate will be within a desired distance from the true value with sufficiently high probability. Since exact calculations resulting from the standard formulation of this problem can be difficult, "conservative" and/or normal approximations are frequently used. In this paper, so...

Few researchers investigating the survival to emergence of embryonic salmonids have simultaneously compared the predictive ability of the percentage of fine sediment less than a given diameter, the geometric mean particle size, and the fredle index. We quantified the relation between these different measures of suhstrate compoaition and survival to emergence of two stocks of brown trout, Salmo ...

The paper presents a new method of sample size determination (SSD) based on performance evaluation of systems under study. The method builds upon previous work on Bayesian approach to nonparametric receiver operating characteristics (ROC) analysis with estimation of probability density functions and confidence intervals for parameters of ROC curve. Technical details of the method together with ...

BACKGROUND Research for developing search strategies to retrieve high-quality clinical journal articles from MEDLINE is expensive and time-consuming. The objective of this study was to determine the minimal number of high-quality articles in a journal subset that would need to be hand-searched to update or create new MEDLINE search strategies for treatment, diagnosis, and prognosis studies. M...

©2010 Particle Sciences, Inc. All rights reserved. centrifugation is a highly accurate technique, but it is not amenable to use with semisolid formulations with high viscosities. All the methods discussed so far may require dilution and while some drug product formulations can be diluted without changing the particle size distribution, others may be affected by dilution, which makes meaningful ...

Statistical criterion for evaluation of individual bioequivalence (IBE) between generic and innovative products often involves a function of the second moments of normal distributions. Under replicated crossover designs, the aggregate criterion for IBE proposed by the guidance of the U.S. Food and Drug Administration (FDA) contains the squared mean difference, variance of subject-by-formulation...