نتایج جستجو برای: stage randomized sampling method based on cochran
تعداد نتایج: 9988966 فیلتر نتایج به سال:
The problem of designing input signals for optimal generalization is called active learning. In this article, we give a two-stage sampling scheme for reducing both the bias and variance, and based on this scheme, we propose two active learning methods. One is the multipoint search method applicable to arbitrary models. The effectiveness of this method is shown through computer simulations. The ...
Due to the explosive growth of data in every aspect of our life, data mining algorithms often suffer from scalability issues. One effective way to tackle this problem is to employ sampling techniques. This paper introduces, ML-DS, a novel deterministic sampling algorithm for mining association rules in large datasets. Unlike most algorithms in the literature that use randomness in sampling, our...
Introduction: This study aimed to investigate the effect of mindfulness on the alexithymia and academic achievement of male middle school students in Ilam, Iran. Materials & Methods: This semi-experimental study was conducted based on a pretest-posttest design using experimental and control groups. The study population included all junior male students of middle school (n=3750) in Ilam (the ...
this study aimed to identify and rank the most important environmental factors for the popularity of recreational sports in iran. only those sensitive aspects of the environment to which recreational sports should react were considered in order to survive. this study was performed consecutively in two qualitative and quantitative phases by mixed heuristic method. for this purpose the experts of...
over the past decades a number of approaches have been applied for forecasting mortality. in 1992, a new method for long-run forecast of the level and age pattern of mortality was published by lee and carter. this method was welcomed by many authors so it was extended through a wider class of generalized, parametric and nonlinear model. this model represents one of the most influential recent d...
Secondary production estimates based on the size-frequency method can be improved through the use of optimal sample allocation without increasing the total sampling effort. We advocate a two-step procedure. First, sampling dates should be chosen to minimize bias. Then, sample sizes on each date should be allocated in such a way as to minimize variance. Calculating the optimal sample allocation ...
health lifestyle as a multi causal phenomenon, multidimensional and multiresonalcontributes to behavioral patterns that deals with health minatory problems of people; and in this way, can guarantee their health. by cockerham vision, health lifestyle realizes with choice concept, but a choice that occurs in social structure that itself affects by different factor. in this paper we try to find th...
previous studies regarding teachers’ beliefs have revealed that teachers’ beliefs have influence on their classroom practices. the current study aimed to investigate the effect of teachers’ beliefs about teaching reading strategies on students’ motivation and success in reading comprehension in the context of english teaching as a foreign language in high schools of mazandaran, iran. data were ...
abstract: the potato tuberworm, phthorimaea operculella (zeller), is an important insect pest of potato (solanum tuberosum l.) in the storage and field in most parts of the world especially in tropical and subtropical regions due to its close relationship with the host, high reproductive potential and high economic losses. information on host preference, life table parameters and digestive en...
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