scholarly journals Compromise Allocation for Combined Ratio Estimates of Population Means of a Multivariate Stratified Population Using Double Sampling in Presence of Non-Response

2014 ◽  
Vol 03 (04) ◽  
pp. 68-78 ◽  
Author(s):  
Sana Iftekhar ◽  
Qazi Mazhar Ali ◽  
Mohammad Jameel Ahsan
Keyword(s):  
Double Sampling ◽  
Population Means ◽  
Compromise Allocation

scholarly journals A note on optimum allocation in multivariate stratified sampling

2003 ◽  
Vol 21 (1) ◽  
pp. 91 ◽  
Author(s):  
M. G. M. Khan ◽  
M. J. Ahsan
Keyword(s):  
Dynamic Programming ◽  
Random Sampling ◽  
Decision Problem ◽  
Stratified Random Sampling ◽  
Nonlinear Programming Problem ◽  
Programming Technique ◽  
Population Means ◽  
Compromise Allocation ◽  
Multivariate Stratified Sampling ◽  
Sampling Cost

In stratified random sampling when several characteristics are to be estimated simultaneously, an allocation that is optimum for one characteristic may be far away from optimum for others. To resolve this conflict the authors formulate the problem of determining optimum compromise allocation as a nonlinear programming problem (NLPP). The allocation obtained is optimum in the sense that it minimizes the sum of weighted variances of the estimated population means of the characteristics subject to a fixed sampling cost. The formulated NLPP is treated as multistage decision problem and solved using dynamic programming technique. A numerical example is presented to illustrate the computational details.

scholarly journals Generalized Classes of Estimators for Population Mean, Ratio and Product Using Rank of Auxiliary Character Under Double Sampling the Non-Respondents

2020 ◽  
Vol 9 (2) ◽  
pp. 1-12
Author(s):  
Raghaw Raman Sinha
Keyword(s):  
Empirical Study ◽  
Comparative Study ◽  
Mean Square Error ◽  
Minimum Mean Square Error ◽  
Double Sampling ◽  
Mean Square ◽  
Population Means ◽  
Population Mean ◽  
Auxiliary Character ◽  
Generalized Classes

AbstractIn the present study, generalized classes of estimators for estimating population mean, ratio and product of two population means using rank of auxiliary character in presence of non-response are proposed. The bias and mean square error of proposed classes of estimators are obtained and their performances examined. Specific conditions under which the members of proposed classes of estimators attain minimum mean square error are obtained. Comparative study of the proposed classes of estimators with the relevant estimators is carried out. An empirical study is given to justify the efficiency of the proposed classes of estimators.

The effect of surgery in tenosynovial giant cell tumours as measured by patient-reported outcomes on quality of life and joint function

2019 ◽  
Vol 101-B (3) ◽  
pp. 272-280 ◽  
Author(s):  
F. G. M. Verspoor ◽  
M. J. L. Mastboom ◽  
G. Hannink ◽  
W. T. A. van der Graaf ◽  
M. A. J. van de Sande ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Giant Cell ◽  
Diffuse Type ◽  
Joint Function ◽  
Population Means ◽  
Sf 36 ◽  
Patient Reported ◽  
The Impact

Aims The aim of this study was to evaluate health-related quality of life (HRQoL) and joint function in tenosynovial giant cell tumour (TGCT) patients before and after surgical treatment. Patients and Methods This prospective cohort study run in two Dutch referral centres assessed patient-reported outcome measures (PROMs; 36-Item Short-Form Health Survey (SF-36), visual analogue scale (VAS) for pain, and Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC)) in 359 consecutive patients with localized- and diffuse-type TGCT of large joints. Patients with recurrent disease (n = 121) and a wait-and-see policy (n = 32) were excluded. Collected data were analyzed at specified time intervals preoperatively (baseline) and/or postoperatively up to five years. Results A total of 206 TGCT patients, 108 localized- and 98 diffuse-type, were analyzed. Median age at diagnosis of localized- and diffuse-type was 41 years (interquartile range (IQR) 29 to 49) and 37 years (IQR 27 to 47), respectively. SF-36 analyses showed statistically significant and clinically relevant deteriorated preoperative and immediate postoperative scores compared with general Dutch population means, depending on subscale and TGCT subtype. After three to six months of follow-up, these scores improved to general population means and continued to be fairly stable over the following years. VAS scores, for both subtypes, showed no statistically significant or clinically relevant differences pre- or postoperatively. In diffuse-type patients, the improvement in median WOMAC score was statistically significant and clinically relevant preoperatively versus six to 24 months postoperatively, and remained up to five years’ follow-up. Conclusion Patients with TGCT report a better HRQoL and joint function after surgery. Pain scores, which vary hugely between patients and in patients over time, did not improve. A disease-specific PROM would help to decipher the impact of TGCT on patients’ daily life and functioning in more detail. Cite this article: Bone Joint J 2019;101-B:272–280.

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