Sri Lankan journal of applied statistics最新文献_第5页

Joint Modeling of Mixed Responses with Bayesian Modeling and Neural Networks: Performance Comparison with Application to Poultry Data 基于贝叶斯模型和神经网络的混合响应联合建模:性能比较及其在家禽数据中的应用

Sri Lankan journal of applied statistics Pub Date : 2018-12-30 DOI: 10.4038/sljastats.v19i2.8019

J. C. Hapugoda, M. Sooriyarachchi

引用次数: 1

Efficiency of Neighbouring Designs for First Order Correlated Models 一阶相关模型邻近设计的效率

Sri Lankan journal of applied statistics Pub Date : 2018-12-30 DOI: 10.4038/sljastats.v19i2.8020

R. S. Kumar

引用次数: 0

Application of Quick Switching System-1 with Single sampling Plan as reference plan through Minimum Sum of Risks in Determining Economic Ordering Policies under Permissible Delay in Payments 基于风险最小和的单抽样方案作为参考方案的快速切换系统-1在确定允许延期付款的经济订货政策中的应用

Sri Lankan journal of applied statistics Pub Date : 2018-12-30 DOI: 10.4038/sljastats.v19i2.7980

K. Veerakumari, H. Aruna

{"title":"Application of Quick Switching System-1 with Single sampling Plan as reference plan through Minimum Sum of Risks in Determining Economic Ordering Policies under Permissible Delay in Payments","authors":"K. Veerakumari, H. Aruna","doi":"10.4038/sljastats.v19i2.7980","DOIUrl":"https://doi.org/10.4038/sljastats.v19i2.7980","url":null,"abstract":"Conventionally, all Economic Ordering model tacitly assumes that the immediate payment with the shipment of the products. But, in practice, the vendor may allow permissible delay in payments to the buyer. Quality management with minimized cost is the crucial factor for organization’s growth. Inspecting 100% of the products are time-consuming and costly especially when it involves destructive testing or inspection cost is huge. Acceptance sampling plan by attributes provides an effective solution to minimize the cost and consumes less time. Quick Switching System-1with two intensity of inspection is ease to apply as it enables instantaneous switch between normal and tightened inspection depends on the quality of the product. With more reliable products normal inspection is employed and vice versa.QSS-1 plan with minimum sum of risks carries another advantage of reducing the consumer and producer’s risk. With the application of the QSS-1 through minimum sum of risks on the EOQ model with permissible delay in payments buyer and vendor gets minimized cost, minimized risk and less time consuming process.","PeriodicalId":91408,"journal":{"name":"Sri Lankan journal of applied statistics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43124467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Airline Seats Allocation Optimization Through Revenue Management 通过收益管理优化航空座位分配

Sri Lankan journal of applied statistics Pub Date : 2018-12-30 DOI: 10.4038/sljastats.v19i2.8021

K. S. Saubhagya, W. M. L. K. N. Wijesekara, I. T. Jayamanne, K. P. A. Ramanayake

{"title":"Airline Seats Allocation Optimization Through Revenue Management","authors":"K. S. Saubhagya, W. M. L. K. N. Wijesekara, I. T. Jayamanne, K. P. A. Ramanayake","doi":"10.4038/sljastats.v19i2.8021","DOIUrl":"https://doi.org/10.4038/sljastats.v19i2.8021","url":null,"abstract":"Revenue Management has recently gained a solid recognition in Airline industry. It acts as a strategic and tactic provider to manage the uncertainty in demand for their perishable products in the most profitable manner as possible. The Airline Revenue Management tries to attain an effective seat inventory control by utilizing the forecasts of future bookings, the revenue values related with each fare class, and the booking requests by the passengers which in turn will maximize the total revenue of a flight. This paper attempts to propose a novel approach in optimizing the seat inventory control by jointly utilizing the statistical forecasting together with revenue management. The revenue value associated with each point of sale (origin) has been considered when locating seats for a future departure instead of concerning the revenue values of each fare class. Further, it describes a method to obtain optimal seat protection levels that should be reserved from a lower fare origin for a higher fare origin and the nested structure of booking limits for each fare origin so as to optimize the seat allocation in a future departure. A novel approach using Functional Principal Component Regression (FPCR) was carried out to model and forecast the future demand and revenue value for each origin, using historical bookings and revenue values. The Expected Marginal Seat Revenue (EMSR) decision model was developed to address the uncertainty associated with this forecasted future demand and to gain the nested structure of booking limits. Finally, the forecasted booking limits were updated with actual booking requests prior to the flight departure. At the point of verification, it showed a remarkably maximized total revenue over the existing method. Thus, it is suggested that the optimal seat allocation for a better seat inventory control in airlines can be achieved by jointly utilizing the proposed FPCR and EMSR methods.","PeriodicalId":91408,"journal":{"name":"Sri Lankan journal of applied statistics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48368714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Can We Ex Post Facto Justify Duckworth-Lewis Rule? 我们能为达克沃斯-刘易斯规则辩护吗？

Sri Lankan journal of applied statistics Pub Date : 2018-12-30 DOI: 10.4038/sljastats.v19i3.8046

Kalyan Joshi, M. B. Rajarshi

引用次数: 0

Improved Estimation of Sensitive Mean Using Hybrid of Partial and Optional Scrambling in the Presence of Non-Sensitive Auxiliary Information 非敏感辅助信息存在下部分加扰和选择性加扰混合的敏感均值估计改进

Sri Lankan journal of applied statistics Pub Date : 2018-12-30 DOI: 10.4038/sljastats.v19i3.8045

Z. Hussain, Waqas Arshad

引用次数: 0

Modeling the Effect of Antipsychotic Drugs on Body Weight of Psychiatric Patients 抗精神病药物对精神病患者体重影响的建模

Sri Lankan journal of applied statistics Pub Date : 2018-12-30 DOI: 10.4038/sljastats.v19i3.8044

S. A. Taiwo, Oladunni O. F. Ololade

引用次数: 0

The Use of Multiple Imputation for Data Subject to Limits of Detection. 对受检出限限制的数据的多重归算的使用。

Sri Lankan journal of applied statistics Pub Date : 2014-01-01 Epub Date: 2014-12-15 DOI: 10.4038/sljastats.v5i4.7792

Ofer Harel, Neil Perkins, Enrique F Schisterman

{"title":"The Use of Multiple Imputation for Data Subject to Limits of Detection.","authors":"Ofer Harel, Neil Perkins, Enrique F Schisterman","doi":"10.4038/sljastats.v5i4.7792","DOIUrl":"https://doi.org/10.4038/sljastats.v5i4.7792","url":null,"abstract":"<p><p>Missing data due to limit of detection and limit of quantification is a common obstacle in epidemiological and biomedical research. We are interested in methodologies that provide unbiased and efficient estimates of these missing data while using popular statistical software. We describe a multiple imputation (MI) procedure for cross-sectional and longitudinal data which examines the sources of variation of hormones levels throughout the menstrual cycle conditional on specific biomarkers. We describe the rational, procedure, advantages and disadvantages of the multiple imputation procedure. We also provide a comparison to commonly used missing data procedures (complete cases analysis and single imputation). We illustrate our approach using the BioCycle data where we are interested in the effects of Vitamin E and Beta-carotene on Progesterone levels. We also evaluate the longitudinal impact of changes in Vitamin E on Progesterone levels over time. Finaly, we demonstrate the advantages of using MI over complete case analysis or naive single replacement in both cross-sectional and longitudinal analysis where measurements below the limit of quantification (LOQ) are unreported. We also illustrate that if available, inclusion of potentially demined unreliable data below the limit of detection (LOD) improves simple estimation substantially.</p>","PeriodicalId":91408,"journal":{"name":"Sri Lankan journal of applied statistics","volume":"5 4","pages":"227-246"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4838401/pdf/nihms752051.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34487518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 26

A maximum Likelihood Approach to Analyzing Incomplete Longitudinal Data in Mammary Tumor Development Experiments with Mice. 分析小鼠乳腺肿瘤发生实验中不完整纵向数据的最大似然法

Sri Lankan journal of applied statistics Pub Date : 2012-01-01 Epub Date: 2013-01-09 DOI: 10.4038/sljastats.v13i0.5124

Jihnhee Yu, Albert Vexler, Alan D Hutson

引用次数: 0