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Papers by Yasir Hassan

Research paper thumbnail of © IDOSI Publications, 2009 Empirical Comparison of Some Approximate Variance Formulae

Abstract: In this paper we have compared various approximate formulae for variance of Horvitz-Tho... more Abstract: In this paper we have compared various approximate formulae for variance of Horvitz-Thompson estimator using first order inclusion probabilities. The empirical study has been conducted with a view to pick the most appropriate approximation for exact variance of the Horvitz-Thompson estimator. The empirical study is based upon two most popular selection procedures for unequal probability sampling. Key words: Unequal probability sampling • Horvitz-Thompson estimator • Approximate Variance formulae

Research paper thumbnail of Efficient estimation combining exponential and ln functions under two phase sampling

In this study, we propose the combination of exponential and ln ratio type estimator to estimate ... more In this study, we propose the combination of exponential and ln ratio type estimator to estimate the mean of Y (Study Variable) by incorporating two auxiliary variables in two phase sampling scheme. Under simple random sampling without replacement, the illustration for mean square error and mathematical comparisons are presented. Several approaches are available in literature to estimate the study variable by using information on the variable of interest. The performance of our proposed estimator is compared with other ratio type estimators theoretically and empirically. It is observed that ratio and exponential ratio estimators considered by various researchers and usual unbiased estimator is less efficient than our proposed estimator. An efficiency comparison is also given using five data sets and simulation studies for checking the merits of our proposed estimator and outcomes are sound and moderately illuminating in comparison to different estimators.

Research paper thumbnail of An exponential and log ratio estimator of population mean using auxiliary information in double sampling

Pakistan Journal of Statistics and Operation Research

In this study an improved version of ratio type exponential estimator is been proposed for estima... more In this study an improved version of ratio type exponential estimator is been proposed for estimating average of study variable when the population parameter(s) information of second auxiliary variable is available. The proposed estimator compared with usual unbiased estimator and conventional ratio estimators numerically and hypothetically. The mean square error is also obtained and checked the efficiency of the proposed estimator with usual ratio,

Research paper thumbnail of Electronic Health Record Systems

Health Informatics, 2006

After reading this chapter, you should know the answers to these questions: • What is the definit... more After reading this chapter, you should know the answers to these questions: • What is the definition of an electronic health record (EHR)? • How does an EHR differ from the paper record? • What are the functional components of an EHR? • What are the benefits of an EHR? • What are the impediments to development and use of an EHR?

Research paper thumbnail of “Empirical Comparison of Some Approximate Variance Formulae of Horvitz-Thompson Estimator”

In this paper we have compared various approximate formulae for variance of Horvitz-Thompson esti... more In this paper we have compared various approximate formulae for variance of Horvitz-Thompson estimator using first order inclusion probabilities. The empirical study has been conducted with a view to pick the most appropriate approximation for exact variance of the Horvitz-Thompson estimator. The empirical study is based upon two most popular selection procedures for unequal probability sampling.

Research paper thumbnail of © IDOSI Publications, 2009 Empirical Comparison of Some Approximate Variance Formulae

Abstract: In this paper we have compared various approximate formulae for variance of Horvitz-Tho... more Abstract: In this paper we have compared various approximate formulae for variance of Horvitz-Thompson estimator using first order inclusion probabilities. The empirical study has been conducted with a view to pick the most appropriate approximation for exact variance of the Horvitz-Thompson estimator. The empirical study is based upon two most popular selection procedures for unequal probability sampling. Key words: Unequal probability sampling • Horvitz-Thompson estimator • Approximate Variance formulae

Research paper thumbnail of Efficient estimation combining exponential and ln functions under two phase sampling

In this study, we propose the combination of exponential and ln ratio type estimator to estimate ... more In this study, we propose the combination of exponential and ln ratio type estimator to estimate the mean of Y (Study Variable) by incorporating two auxiliary variables in two phase sampling scheme. Under simple random sampling without replacement, the illustration for mean square error and mathematical comparisons are presented. Several approaches are available in literature to estimate the study variable by using information on the variable of interest. The performance of our proposed estimator is compared with other ratio type estimators theoretically and empirically. It is observed that ratio and exponential ratio estimators considered by various researchers and usual unbiased estimator is less efficient than our proposed estimator. An efficiency comparison is also given using five data sets and simulation studies for checking the merits of our proposed estimator and outcomes are sound and moderately illuminating in comparison to different estimators.

Research paper thumbnail of An exponential and log ratio estimator of population mean using auxiliary information in double sampling

Pakistan Journal of Statistics and Operation Research

In this study an improved version of ratio type exponential estimator is been proposed for estima... more In this study an improved version of ratio type exponential estimator is been proposed for estimating average of study variable when the population parameter(s) information of second auxiliary variable is available. The proposed estimator compared with usual unbiased estimator and conventional ratio estimators numerically and hypothetically. The mean square error is also obtained and checked the efficiency of the proposed estimator with usual ratio,

Research paper thumbnail of Electronic Health Record Systems

Health Informatics, 2006

After reading this chapter, you should know the answers to these questions: • What is the definit... more After reading this chapter, you should know the answers to these questions: • What is the definition of an electronic health record (EHR)? • How does an EHR differ from the paper record? • What are the functional components of an EHR? • What are the benefits of an EHR? • What are the impediments to development and use of an EHR?

Research paper thumbnail of “Empirical Comparison of Some Approximate Variance Formulae of Horvitz-Thompson Estimator”

In this paper we have compared various approximate formulae for variance of Horvitz-Thompson esti... more In this paper we have compared various approximate formulae for variance of Horvitz-Thompson estimator using first order inclusion probabilities. The empirical study has been conducted with a view to pick the most appropriate approximation for exact variance of the Horvitz-Thompson estimator. The empirical study is based upon two most popular selection procedures for unequal probability sampling.

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