Estimation under two stage random permutation models

Considering certain generalised random permutation models we have derived optimal estimators of finite population variance within a general class of quadratic estimators. The class of non-negative unbiased polynomial estimators of variance has also been examined and an optimal estimator within that class has been derived under this model.

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Design-based random permutation models with auxiliary information

Statistics ◽

10.1080/02331888.2010.545408 ◽

2012 ◽

Vol 46 (5) ◽

pp. 663-671

Author(s):

Wenjun Li ◽

Edward J. Stanek ◽

Julio M. Singer

Keyword(s):

Auxiliary Information ◽

Random Permutation ◽

Permutation Models

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Optimal estimation of a finite population mean under generalized random permutation models

Journal of Statistical Planning and Inference ◽

10.1016/0378-3758(78)90002-2 ◽

1978 ◽

Vol 2 (2) ◽

pp. 125-141 ◽

Cited By ~ 24

Author(s):

J.N.K. Rao ◽

D.R. Bellhouse

Keyword(s):

Finite Population ◽

Optimal Estimation ◽

Random Permutation ◽

Population Mean ◽

Permutation Models

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Two-stage self-seeding method for preparation of single crystals of poly(phenylene sulfide)

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100153816 ◽

1989 ◽

Vol 47 ◽

pp. 368-369

Author(s):

Sengshiu Chung ◽

Peggy Cebe

Keyword(s):

Single Crystals ◽

High Performance ◽

Dilute Solution ◽

Two Stage ◽

Annealing Behavior ◽

High Performance Polymers ◽

Seeding Method ◽

Phenylene Sulfide

We are studying the crystallization and annealing behavior of high performance polymers, like poly(p-pheny1ene sulfide) PPS, and poly-(etheretherketone), PEEK. Our purpose is to determine whether PPS, which is similar in many ways to PEEK, undergoes reorganization during annealing. In an effort to address the issue of reorganization, we are studying solution grown single crystals of PPS as model materials.Observation of solution grown PPS crystals has been reported. Even from dilute solution, embrionic spherulites and aggregates were formed. We observe that these morphologies result when solutions containing uncrystallized polymer are cooled. To obtain samples of uniform single crystals, we have used two-stage self seeding and solution replacement techniques.

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