نتایج جستجو برای: missing
تعداد نتایج: 62925 فیلتر نتایج به سال:
s (pp. 6242-6248).
Abstract: Suppose Y is a response variable, possibly multivariate, with a density function f(y|x, v;β) conditional on the covariates (x, v) where x and v are vectors and β is a vector of unknown parameters. The authors consider the problem of estimating β when data on the covariate vector v are available for all observations while data on the covariate x are missing at random. They compare seve...
Between 1982 and 1988 a growth study was carried out at the Division of Pediatric Oncology of the University Hospital of Groningen. A special feature of the project was that sample sizes are small and that ages at entry may be very different. In addition the intended design was not fully complied with. This paper highlights some aspects of the statistical analysis which is based on (1) referenc...
Archibald and Knopfmacher recently considered the largest missing value in a composition of an integer and established the mean and variance. Our alternative, probabilistic approach produces (in principle) all moments in an almost automatic way. In order to show that our forms match the ones given by Archibald and Knopfmacher, we have to derive some identities which are interesting on their own...
Introduction & Objective: DMFT Index is the best epidemiologic caries index in dentistry and can show the state of oral and dental hygiene in one society. By considering this index we can design suitable preventive and treatment program for total population of a society. The aim of this descriptive analytical study was evaluation of DMF6 index in 12 years old children in Hamadan city. Mate...
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