Volume 41 Number 1 (2007) September 22, 2007September 22, 2023 Publisher Estimation of autoregressive coefficient in an ARMA (1,1) model with vague information on the MA component By M. Ould Haye Shrinkage testimation for the variance of a normal distribution under asymmetric loss function By Gyan Prakash, and B. N. Pandey Moments of order statistics from doubly truncated Burr XII distribution: a complementary note with applications By Shola Adeyemi, and Atinuke O. Adebanji Method of product spacings in the two-parameter gamma distribution By Mezbahur Rahman, Larry M. Pearson and Uros R Martinovic Approximating the cumulative distribution function of the normal distribution By Amit Choudhury, Subhasis Ray, and Pradipta Sarkar Comparison between k-NN and k-RNN classification rules: a Monte Carlo simulation By Using a two-stage minimum aberration criterion to select optimal two-level fractional factorial designs By Weiming Ke, Cuirong Ren and Huitian Lu