نتایج جستجو برای: cluster sampling

تعداد نتایج: 402542  

پایان نامه :دانشگاه بین المللی امام خمینی (ره) - قزوین - دانشکده علوم اجتماعی 1389

چکیده در این پژوهش، رابطه بین سبک های مقابله ای با جرأت ورزی و پرخاشگری در دانشجویان دانشگاه بین المللی امام خمینی (ره) بررسی شد. نمونه مورد بررسی، شامل 200 نفر (121 زن و 79 مرد) از دانشجویان دانشگاه مورد نظر در دو جنس است که از طریق روش نمونه گیری خوشه ای تصادفی، انتخاب و به پرسشنامه های الگوهای پاسخ دهی بین فردی تونند و پرسشنامه سبک های مقابله ای اندلر و پارکر پاسخ دادند. همچنین از روش های ...

2007
Neil F. Johnson Michael Spagat Sean Gourley Jukka-Pekka Onnela Gesine Reinert

Cluster sampling has recently been used to estimate the mortality in various conflicts around the world. The Burnham et al. (2006) study on Iraq employs a new variant of this cluster sampling methodology. The stated methodology of Burnham et al. (2006) is to (1) select a random main street, (2) choose a random cross street to this main street, and (3) select a random household on the cross stre...

Journal: :Expert Syst. Appl. 2009
Show-Jane Yen Yue-Shi Lee

For classification problem, the training data will significantly influence the classification accuracy. However, the data in real-world applications often are imbalanced class distribution, that is, most of the data are in majority class and little data are in minority class. In this case, if all the data are used to be the training data, the classifier tends to predict that most of the incomin...

2003
J. H. Chauchat R. Rakotomalala F. Pellegrino

If the dataset available to machine learning results from cluster sampling, the usual cross-validation error rate estimate can lead to biased and misleading results. An adapted cross-validation is described for this case. Using a simulation, the sampling distribution of the generalization error rate estimate, under cluster or simple random sampling hypothesis, are compared to the true value. Th...

Journal: :Vital and health statistics. Series 2, Data evaluation and methods research 1973
J Waksberg R H Hanson C A Jacobs

The practice of grouping the elements of the universe of study into clusters and sampling the clusters is a common feature of sample designs. Dealing with clusters of elements ahnost invariably increases the sampling error of the statistics estimated from the sample. However, clustering usually reduces the per-unit costs of the sampling and data collection. As the cluster size is increased, the...

1990
Yongzheng Zhang Rui Zhang

This paper introduces an external memory parallel sorting algorithm in a multiprocessor architecture. The overall goal is to choose p − 1 partitioning elements so that the final p sorted files, one per processor, are of roughly equal size. It first determines a sample of splitters by either regular sampling or random sampling techniques. Then each data file at each processor is separated accord...

2015
Christina DELIMITROU Daniel SANCHEZ Christos KOZYRAKIS

Scheduling diverse applications in large, shared clusters is particularly challenging. Recent research on cluster management focuses either on scheduling speed, using sampling techniques to quickly assign tasks to resources, or on scheduling quality, using centralized algorithms that examine the cluster state to find the most suitable resources that improve both task performance and cluster uti...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه مازندران - دانشکده علوم پایه 1386

چکیده ندارد.

Journal: :iranian journal of public health 0
k. mohammad m.r. zalie s. sirous m.r. masjedi

the purpose of this study was to investigate the status and epidemiology of intestinal parasites in iran. the information was driven from an extensive health survey which was done by the ministry of health and medical education, deputy of research affairs in 1990-92. sampling fraction was 1 per 1000 of individuals aged between 2 and 69, the sampling method was cluster sampling and each cluster ...

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