One possible reason for the continued neglect of statistical power analysis in research in the behavioral sciences is the inaccessibility of or difficulty with the standard material. A convenient, although not comprehensive, presentation of required sample sizes is provided here. Effect-size indexes and conventional values for these are given for operationally defined small, medium, and large e...

The contrast sensitivity function (CSF) has shown promise as a functional vision endpoint for monitoring the changes in functional vision that accompany eye disease or its treatment. However, detecting CSF changes with precision and efficiency at both the individual and group levels is very challenging. By exploiting the Bayesian foundation of the quick CSF method (Lesmes, Lu, Baek, & Albright,...

The views expressed in this paper are those of the author and do not necessarily reflect the views of the Arab Monetary Fund. Abstract While it is well documented that privatization leads to an improvement in the performance of state-owned enterprises (SOEs) following divestiture, it is argued that many of these studies do not consider the performance of control firms of similar pre-privatizati...

It is well known that sequential hypothesis test procedures can have appreciable cost savings compared to fixed sample size test plans. The first sequential hypothesis procedure was developed by Wald for one-parameter families of distributions and later extended by Bartlett to handle the case of nuisance parameters. However, Bartlett’s procedure requires independent and identically distributed ...

The most elementary statistical test is the paired samples t-test with just two pairs. Here the data set to be analysed consists of two numbers (the two paired differences), and the statistical test examines whether the population mean is zero. This test can be derived in a surprisingly fast and intuitive manner by plotting one number against the other on a piece of graph paper, then joining th...

BACKGROUND The 15-item care transition measure (CTM-15) is a reliable and valid instrument assessing the quality of care transition from patients' perspectives. The aim of this study was to evaluate the psychometric properties of the CTM-15 and the CTM-3 (a 3-item short version of the CTM-15) in Mainland China. METHODOLOGY/FINDINGS This was a cross-sectional study with a convenience sample of...

background an absolute prerequisite to the effective management of dementia is its early diagnosis. successful dementia screening requires precise and sensitive instruments that can be completed even by illiterate elderly people. objectives the aim of this study was to evaluate the psychometric properties of the persian version of the cognitive state test (cost). materials and methods this meth...