RISK PERFORMANCES OF THE BIAS CORRECTED FEASIBLE MINIMUM MEAN SQUARED ERROR ESTIMATORS UNDER BALANCED LOSS

In this paper, we examine the risk performances of the bias corrected variants of the feasible minimum mean squared error (FMMSE) estimator and the adjusted FMMSE estimator under balanced loss. It is shown by numerical evaluations that although the bias correction can be effective under balanced loss for some cases, the bias correction is not effective for other cases

Diagnosis of biliary tract and ampullary carcinomas

Diagnostic methods for biliary tract carcinoma and the efficacy of these methods are discussed. Neither definite methods for early diagnosis nor specific markers are available in this disease. When this disease is suspected on the basis of clinical symptoms and risk factors, hemato-biochemical examination and abdominal ultrasonography are performed and, where appropriate, enhanced computed tomography (CT) and/or magnetic resonance cholangiopancreatography (MRCP) is carried out. Diagnoses of extrahepatic bile duct cancer and ampullary carcinoma are often made based on the presence of obstructive jaundice. Although rare, abdominal pain and pyrexia, as well as abnormal findings of the hepatobiliary system detected by hemato-biochemical examination, serve as a clue to making a diagnosis of these diseases. On the other hand, the early diagnosis of gallbladder cancer is scarcely possible on the basis of clinical symptoms, so when this cancer is found with the onset of abdominal pain and jaundice, it is already advanced at the time of detection, thus making a cure difficult. When gallbladder cancer is suspected, enhanced CT is carried out. Multidetector computed tomography (MDCT), in particular — one of the methods of enhanced CT — is useful for decision of surgical criteria, because MDCT shows findings such as localization and extension of the tumor, and the presence or absence of remote metastasis. Procedures such as magnetic resonance imaging, endoscopic ultrasonography, bile duct biopsy, and cholangioscopy should be carried out taking into account indications for these procedures in individual patients. However, direct biliary tract imaging is necessary for making a precise diagnosis of the horizontal extension of bile duct cancer

Relationship between classroom social goal structures, gender, and social outcomes in Japanese elementary school children

This study examines the interaction between gender and classroom social goal structures and the impact they have on children's prosocial behaviors and classroom adjustment. Specifically, classroom social goal structures (consisting of prosocial and compliance goal structure) are the degree to which focal social goals are presented in classrooms. Numerous previous studies have tested the gender differences in social outcomes; however, the results of such past studies have been mixed, as some detected gender differences while others did not. This suggests the existence of moderator variables. Consequently, in this research, we focused on classroom-level moderators in the relationship between gender and social outcomes. We analysed a sample of 3,609 Japanese public elementary school children from 114 classrooms, and we detected the presence of cross-level interactions and found that classroom social goal structures can promote or degrade boys' social outcomes