in this paper, three-stage assembly flowshop scheduling is considered with respect to minimizing bi-objectives, namely mean flow time and mean tardiness. this problem is a model of production systems, which several production operations are done simultaneously and independently, and then produced components are collected and transferred to an assembly stage for the final operation. in this mode...

This paper provides a root-n consistent, asymptotically normal weighted least squares estimator of the coefficients in a truncated regression model. The distribution of the errors is unknown and permits general forms of unknown heteroskedasticity. Also provided is an instrumental variables based two stage least squares estimator for this model, which can be used when some regressors are endogen...

in order to determine resistance genetically potential of some bean genotypes to bean common mosaic virus, two separated experiments in randomized complete block design with 25 genotypes and three replications was conducted in iau shiraz branch. the first experiment and the second one were performed in normal and bcmv infected conditions, respectively. plants were inoculated in cotyledon leaf a...

In a two-stage linear regression model with Normal noise, I consider James–Stein type shrinkage in the estimation of the first-stage instrumental variable coefficients. For at least four instrumental variables and a single endogenous regressor, I show that the standard two-stage least-squares estimator is dominated with respect to bias. I construct the dominating estimator by a variant of James...

Recent study into students’ performance on large-scale tests of academic achievement has revealed some tests of achievement, including those in science, as multidimensional (e.g., Ayala, Shavelson, Yin, & Shultz, 2002; Hamilton, Nussbaum, Kupermintz, Kerkhoven, & Snow 1995; Leighton, Gokiert, & Cui, 2005; Nussbaum, Hamilton, & Snow 1997). According to the Standards for Educational and Psycholog...