نتایج جستجو برای: a cluster sampling

تعداد نتایج: 13494356  

Journal: :Journal of Physics A 2021

We present a method for computing transition points of the random cluster model using generalization Newman-Ziff algorithm, celebrated technique in numerical percolation, to model. The new is straightforward implement and works real weight $q>0$. Furthermore, results an arbitrary number values $q$ can be found at once within single simulation. Because algorithm used sweep through bond configura...

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 ...

Journal: :Mathematics and Computers in Simulation 2013
Jennifer A. Brown Mohammad Salehi M. Mohammad Moradi Bardia Panahbehagh David R. Smith

Designing an efficient large-area survey is a challenge, especially in environmental science when many populations are rare and clustered. Adaptive and unequal probability sampling designs are appealing when populations are rare and clustered because survey effort can be targeted to subareas of high interest. For example, higher density subareas are usually of more interest than lower density a...

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...

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

چکیده ندارد.

Journal: :تحقیقات اقتصاد و توسعه کشاورزی ایران 0
مریم شریف زاده دانشکده کشاورزی دانشگاه شیراز، اقتصاد و توسعه کشاورزی علی اکبر کامکار حقیقی دانشکده کشاورزی دانشگاه شیراز، اقتصاد و توسعه کشاورزی مصطفی احمدوند دانشگاه یاسوج، اقتصاد و توسعه کشاورزی آرتمیس رودری دانشکده کشاورزی دانشگاه شیراز، مهندسی آب زینب امیری دانشکده کشاورزی دانشگاه شیراز، مهندسی آب

this research, applied as a survey approach aimed at investigating farmers’ tendency and attitudes toward agricultural water management styles (wmss). therefore, using cochran’s formula and simple random sampling, 244 farmers were selected in doroudzan region, iran. the data were acquired by face-to-face structural interviews and as well through a questionnaire that consisted of closed and open...

2002
JIANWEN CAI BAHJAT QAQISH HAIBO ZHOU

Cluster-based case-control design refers to a design where the sampling unit is a cluster and the sampling probability depends on the responses from individuals within the cluster. Data from a cluster-based case-control design arise in many practical applications. For example, in some epidemiologic genetic studies, due to the low prevalence of the disease of interest, families with more members...

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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