نتایج جستجو برای: standard sample unit
تعداد نتایج: 1239427 فیلتر نتایج به سال:
Abstract Background: The importance of timing lies on providing services, identifying the current status of service delivery, and determining the workload to improve productivity of the organization and the level of satisfaction of service providers and recipients. The aim of this study is to investigate the timing of patient's workflow, in order to identify the current state of service delive...
ing the common features from the foregoing illustrations the following model evolves : 1. Two groups are to be compared. For conciseness of notation, in this paper, they shall be referred to as control (C) and treated (T), although certainly any situation involving two groups will apply. 2. The outcome or endpoint variable consists of two event states, e.g. deathsurvival. 3. For each member of ...
Despite the potential benefits of sequential designs, studies evaluating treatments or experimental manipulations in preclinical experimental biomedicine almost exclusively use classical block designs. Our aim with this article is to bring the existing methodology of group sequential designs to the attention of researchers in the preclinical field and to clearly illustrate its potential utility...
We proposed a test for assessing multivariate normality of the high-dimensional data which the dimension is larger than the sample size. The classical tests based on the sample measures of multivariate skewness and kurtosis defined by Mardia (1970) or Srivastava (1984) do not work for the high-dimensional case. The proposed test does not require explicit conditions on the relationship between t...
The accuracy in parameter estimation approach to sample size planning is developed for the coefficient of variation, where the goal of the method is to obtain an accurate parameter estimate by achieving a sufficiently narrow confidence interval. The first method allows researchers to plan sample size so that the expected width of the confidence interval for the population coefficient of variati...
BACKGROUND A sample size containing at least 100 events and 100 non-events has been suggested to validate a predictive model, regardless of the model being validated and that certain factors can influence calibration of the predictive model (discrimination, parameterization and incidence). Scoring systems based on binary logistic regression models are a specific type of predictive model. OBJE...
Composite measures play an important role in psychology and related disciplines. Composite measures almost always have error. Correspondingly, it is important to understand the reliability of the scores from any particular composite measure. However, the point estimates of the reliability of composite measures are fallible and thus all such point estimates should be accompanied by a confidence ...
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