Intra-rater reliability

About: Intra-rater reliability is a research topic. Over the lifetime, 2073 publications have been published within this topic receiving 140968 citations.

Repeatability of ultrasonographic median nerve measures.

Abstract: In this study we investigated the reliability of ultrasound in measuring median nerve characteristics including cross-sectional area (CSA), flattening ratio (FR), swelling ratio (SR), and mean grayscale. Generalizability theory was used to assess inter- and intrarater reliability using the dependability coefficient (phi), normalized standard error of measurement, and normalized minimum detectable change (MDC(NORM)) for multiple study design protocols. Interrater reliability was generally moderate. Intrarater reliability was mostly good (phi > 0.876) when using a single image, captured on one occasion, and being read once. Intrarater MDC(NORM) ranged from 3.8% to 6.2% for all CSA measures and SR. Using multiple images and/or readings at multiple occasions did not appreciably improve reliability measures. Ultrasound is a reliable tool for measuring median nerve characteristics. We recommend that a single evaluator capture all images for protocols aimed at quantifying median nerve ultrasound measures. We believe an appropriately designed protocol can utilize ultrasound to accurately assess changes in median nerve characteristics after activity.

A Modified Reliability Index Approach for Reliability-Based Design Optimization

Abstract: RBDO problems have been intensively studied for many decades. Since Hasofer and Lind defined a measure of the second-moment reliability index, many RBDO methods utilizing the concept of reliability index have been introduced as the Reliability Index Approach (RIA). In the RIA, a reliability analysis problem is formulated to find the reliability index for each performance constraint and the solutions are used to evaluate the failure probability. However, the traditional RIA suffers from inefficiency and convergence problems. In this paper, we revisited the definition of the reliability index and revealed the convergence problem in the traditional RIA. Furthermore, a new definition of the reliability index is proposed to correct this problem and a modified Reliability Index Approach based on this definition is developed. Numerical examples using both the traditional RIA and the modified RIA are compared and discussed.Copyright © 2009 by ASME

Reliability and validity of a memory test battery

Abstract: In a series of studies we have applied three memory tests (the 30 Word Pair test, the 20 (or 30) Figure test and the 30 Personal Data test) to analyse memory disturbances related to electroconvulsive therapy (ECT) . We have, inter al., used them to study retrograde amnesia (Cronholm & Ottosson, 1961, 1963) and anterograde amnesia (Ottosson, 1960) on the day of the first treatment. In these studies we compared test results in the same individuals under control (pre-shock) and experimental (post-shock) conditions. I t may be seen from our earlier reports that the tests have proved to be valid to the influence of ECT. The aim of the present study is to analyse further the properties of the tests. First, we will analyse their internal-consistency reliability under control and experimental conditions. Second, we will examine and obtain a value of the concurrent ualidity relative to the influence of ECT. Third, on the basis of test correlations we will test a hypothesis on a construct ualidity of the tests. Our hypothesis is that corresponding score,s in all the tests measure two underlying, hypothetical constructs that are more or less independent of each other, “learning” and “retention”. Finally, we will study to what extent the reliability and concurrent validity may be increased by combining measures in all three tests. In fact, we have used combined measures in previous studies, on the basis of the expectation a priori that they would be more valid than measures from ,separate tests.