January 2013

Bianchi Type I tilted perfect fluid cosmological model in general relativity

    In this paper, we have investigated a tilted Bianchi Type I cosmological model filled with dust of perfect fluid in general relativity because tilted dust models are quite homogeneous and expanding. To get a determinate solution, we have assumed a linear relation between shear and expansion, that is, = constant ( is shear tensor and is expansion of the model), which leads to A =...

Author(s):   Anita Bagora and Pushpa Bagora

January 2013

Some new aspects on imputation in sampling

     The number of causes that affect the quality of survey and missing data is one of such that keeps sample incomplete. Many imputation methods are available in literature, and are used to replace missing observations like Mean method, Ratio method, Compromised method, Ahmed’s method, Factor-type (F-T) method etc. This paper suggests some new estimation aspects in imputation theory...

Author(s):     Diwakar Shukla, Narendra Singh Thakur and Sharad Pathak