Estimation of the ratio of variance components is considered for a balanced one-way random effects model. Problem arises as the readily available estimates can take negative values. Although there are some nonnegative estimates, they do not have any optimum property. Two different paths are...

It is widely believed that the decline in agricultural productivity in the Dhemaji district of Assam, India, is due to flood-induced sand depositions in paddy fields. Increased sand content reduces the water retaining capacity of soils and reduces crop productivity. Soil tests in 346...

In this article, we propose a family of bounded influence robust estimates for the parametric and non-parametric components of a generalized partially linear mixed model that are subject to censored responses and missing covariates. The asymptotic properties of the proposed estimates have been...