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Article | 13-December-2019

ESTIMATING POPULATION COEFFICIENT OF VARIATION USING A SINGLE AUXILIARY VARIABLE IN SIMPLE RANDOM SAMPLING

This paper proposes an improved estimation method for the population coefficient of variation, which uses information on a single auxiliary variable. The authors derived the expressions for the mean squared error of the proposed estimators up to the first order of approximation. It was demonstrated that the estimators proposed by the authors are more efficient than the existing ones. The results of the study were validated by both empirical and simulation studies.

Rajesh Singh, Madhulika Mishra

Statistics in Transition New Series, Volume 20 , ISSUE 4, 89–111

Article | 20-December-2020

Comparing particulate matter dispersion in Thailand using the Bayesian Confidence Intervals for ratio of coefficients of variation

Recently, harmful levels of air pollution have been detected in many provinces of Thailand. Particulate matter (PM) contains microscopic solids or liquid droplets that are so small that they can be inhaled and cause serious health problems. A high dispersion of PM is measured by a coefficient of variation of log-normal distribution. Since the log-normal distribution is often used to analyse environmental data such as hazardous dust particle levels and daily rainfall data. These data focus the

Warisa Thangjai, Suparat Niwitpong

Statistics in Transition New Series, Volume 21 , ISSUE 5, 41–60

Article | 20-September-2020

Power Size Biased Two-Parameter Akash Distribution

In this paper, the two-parameter Akash distribution is generalized to size-biased twoparameter Akash distribution (SBTPAD). A further modification to SBTPAD is introduced, creating the power size-biased two-parameter Akash distribution (PSBTPAD). Several statistical properties of PSBTPAD distribution are proved. These properties include the following: moments, coefficient of variation, coefficient of skewness, coefficient of kurtosis, the maximum likelihood estimation of the distribution

Khaldoon Alhyasat, Ibrahim Kamarulzaman, Amer Ibrahim Al-Omari, Mohd Aftar Abu Bakar

Statistics in Transition New Series, Volume 21 , ISSUE 3, 73–91

Sampling Methods | 22-July-2018

EFFICIENT ESTIMATORS OF POPULATION MEAN USING AUXILIARY INFORMATION UNDER SIMPLE RANDOM SAMPLING

In the present study we have proposed an improved family of estimators for estimation of population mean using the auxiliary information of median, quartile deviation, Gini’s mean difference, Downton’s Method, Probability Weighted Moments and their linear combinations with correlation coefficient and coefficient of variation. The performance of the proposed family of estimators is analysed by mean square error and bias and compared with the existing estimators in the literature. By

Mir Subzar, Showkat Maqbool, Tariq Ahmad Raja, Surya Kant Pal, Prayas Sharma

Statistics in Transition New Series, Volume 19 , ISSUE 2, 219–238

Article | 01-September-2015

DESIGN AND IMPLEMENTATION OF INTELLIGENT INTEGRATED MEASURING AND CONTROLLING SYSTEM FOR SUGAR CANE CRYSTALLIZATION PROCESS

and supersaturation. The less mother liquor purity in the final stage is, the better absorption of crystals have. Crystal size distribution, including mean area (MA) and coefficient of variation (CV), influences the quantity and quality of crystals. In order to produce sucrose which has uniform size and small coefficient of variation, it’s necessary to study the law of crystal size for sugar cane crystallization. According to the difficulties in measuring some key parameters, an intelligent

Yanmei Meng, Kangyuan Zheng, Wenxing Li, Haifeng Pang, Guancheng Lu, Guangquan Li

International Journal on Smart Sensing and Intelligent Systems, Volume 8 , ISSUE 3, 1687–1705

Article | 28-August-2018

VALIDATION OF THE FIB 2010 AND RILEM B4 MODELS FOR PREDICTING CREEP IN CONCRETE

concretes under laboratory-controlled conditions. Both models investigated under-estimated the creep strain. In addition, the MC 2010 Model, which yielded an overall coefficient of variation (ωall) of 50.4%, was found to be more accurate than the RILEM B4 Model (with a ωall of 102.3%).

George C. FANOURAKIS

Architecture, Civil Engineering, Environment, Volume 10 , ISSUE 3, 95–101

Article | 06-July-2017

SUJATHA DISTRIBUTION AND ITS APPLICATIONS

In this paper a new one-parameter lifetime distribution named “Sujatha Distribution” with an increasing hazard rate for modelling lifetime data has been suggested. Its first four moments about origin and moments about mean have been obtained and expressions for coefficient of variation, skewness, kurtosis and index of dispersion have been given. Various mathematical and statistical properties of the proposed distribution including its hazard rate function, mean residual life function

Rama Shanker

Statistics in Transition New Series, Volume 17 , ISSUE 3, 391–410

Research Article | 24-August-2017

A THREE-PARAMETER WEIGHTED LINDLEY DISTRIBUTION AND ITS APPLICATIONS TO MODEL SURVIVAL TIME

In this paper a three-parameter weighted Lindley distribution, including Lindley distribution introduced by Lindley (1958), a two-parameter gamma distribution, a two-parameter weighted Lindley distribution introduced by Ghitany et al. (2011) and exponential distribution as special cases, has been suggested for modelling lifetime data from engineering and biomedical sciences. The structural properties of the distribution including moments, coefficient of variation, skewness, kurtosis and index

Rama Shanker, Kamlesh Kumar Shukla, Amarendra Mishra

Statistics in Transition New Series, Volume 18 , ISSUE 2, 291–310

Article | 11-June-2016

AN IMPROVED MULTI-OBJECTIVE EVOLUTIONARY OPTIMIZATION ALGORITHM FOR SUGAR CANE CRYSTALLIZATION

The nature of optimization for intermittent sugar cane crystallization process is to obtain ideal crystals. One typical difficulty in crystallization optimization refers to the simultaneous effects of both seeding characters and process variables on the final crystal size distribution (CSD) parameters, including mean size (MA) and coefficient of variation (CV). And the application of traditional multi-objective evolutionary algorithm in crystallization process could not optimize all of them

Yanmei Meng, Wenxing Li, Qingwei Chen, Xian Yu, Kangyuan Zheng, Guancheng Lu

International Journal on Smart Sensing and Intelligent Systems, Volume 9 , ISSUE 2, 953–978

Article | 05-September-2021

A calibrated synthetic estimator for small area estimation

relative bias and greater efficiency. Moreover, they prove more consistent than the existing classical synthetic estimator. The further evaluation carried out using the coefficient of variation provides additional confirmation of the calibrated estimator’s advantage over the existing ones in relation to small area estimation.

Matthew Joshua Iseh, Ekaette Inyang Enang

Statistics in Transition New Series, Volume 22 , ISSUE 3, 15–30

Article | 24-July-2017

Sampling Error in Relation to Cyst Nematode Population Density Estimation in Small Field Plots

soil. Goodness of fit of data to probability distribution tested with x2 test confirmed a negative binomial distribution of cyst counts for 21 out of 23 plots. The recommended measure of sampling precision of 17% expressed through coefficient of variation (cv) was achieved if the plots of 1m2 contaminated with more than 90 cysts per 100 g of soil were sampled with 10-core bulk samples taken in five repetitions. If plots were contaminated with less than 75 cysts per 100 g of soil, 10-core bulk

VESNA ZUPUNSKI, RADIVOJE JEVTIC, VESNA SPASIC JOKIC, LJUBICA ZUPUNSKI, MIRJANA LALOSEVIC, MIHAJLO CIRIC, ZIVKO CURCIC

Journal of Nematology, Volume 49 , ISSUE 2, 150–155

research-paper | 18-June-2021

Ultrasound evaluation of the scapholunate ligament and scapholunate joint space in patients with wrist complaints in a rheumatologic setting

normal subjects selected from hospital personnel in order to confirm the normal width of the scapholunate joint, and to calculate the coefficient of variation for this procedure. All subjects had a comparable age and sex, did not suffer from wrist pain or swelling, nor any rheumatic disease. All patients gave their informed consent to undergo the routine diagnostic pathway. The study was carried out in compliance with the Helsinki Declaration, but ethical approval was not required in view of the

Paolo Falsetti, Edoardo Conticini, Caterina Baldi, Marco Bardelli, Suhel Gabriele Al Khayyat, Roberto D’Alessandro, Luca Cantarini, Bruno Frediani

Journal of Ultrasonography, Volume 21 , ISSUE 85, e105–e111

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