نتایج جستجو برای: stratified sampling

تعداد نتایج: 247726  

2007
PHILIP B. STARK

There are many sources of error in counting votes: the apparent winner might not be the rightful winner. Hand tallies of the votes in a random sample of precincts can be used to test the hypothesis that a full manual recount would find a different outcome. This paper develops a conservative sequential test based on the vote-counting errors found in a hand tally of a simple or stratified random ...

Journal: :Kybernetika 1989
Covadonga Caso María Angeles Gil

The First Part of this paper deals with the study of the precision of an unbiased estimator of a population income inequality index in the stratified samplings with and without replacement. In this Second Part, we first analyze the asymptotic distribution of the sample income inequality index. Then, we establish different criteria to select the suitable sample size to estimate the population in...

2014
Nuru Aisyah Sim Abdullah Noor Laila Mohd Noor Emma Nuraihan Mior Ibrahim

Researchers have highlighted that the main factors that contribute to IT service failure are the people, process and technology. However, relatively few empirical studies examine to what degree these factors contribute to service disruptions in the public sector organizations. This study explores the IT service management (ITSM) at eight (8) Front-end Agencies, four (4) Ministries and six (6) D...

Journal: :Journal of Applied Mathematics and Decision Sciences 2000

Journal: :Pakistan Journal of Statistics and Operation Research 2019

Journal: :Electronic Journal of Statistics 2007

Journal: :International Journal for Uncertainty Quantification 2022

Science and engineering problems subject to uncertainty are frequently both computationally expensive feature nonsmooth parameter dependence, making standard Monte Carlo too slow, excluding efficient use of accelerated quantification methods relying on strict smoothness assumptions. To remedy these challenges, we propose an adaptive stratification method suitable for with significantly reduced ...

2013
Raja Irfan Sabir Wasim Ahmad Rana Umair Ashraf Nadeem Ahmad

The higher education environment in Pakistan has become very aggressive and universities have to struggle for recruiting highly intellectual students. The students have become consumerists due to increasing fees of higher education institutes. The primary focus of this study was to uncover the factors that students deem vital related to their choice of university and desired courses. Undergradu...

2012
Sai Tang Jianyu Yang Chao Zhang Dehai Zhu Wenju Yun

Through the monitoring network for cultivated land quality in county area, distribution and changing trend of the quality should be reflected. Besides, the quality of non-sampled locations should also be estimated with the data of sampling points. Due to the correlation among spatial samples, traditional methods such as simple random sampling, stratified sampling and systematic sampling are ine...

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