The table below shows estimated future cost-of-living adjustments (COLAs) and estimated future percentage increases in the national average wage index (AWI). These estimates are derived from the intermediate assumptions in the 2015 Trustees Report.he table below shows estimated future cost-of-living adjustments (COLAs) and estimated future percentage increases in the national average wage index (AWI). These estimates are derived from the intermediate assumptions in the 2015 Trustees Report.
Item Analysis. Item Analysis is an important (probably the most important) tool to increase test effectiveness. Each items contribution is analyzed and assessed. To write effective items, it is necessary to examine whether they are measuring the fact, idea, or concept for which they were intended.
Item Analysis describes the statistical analyses which allow measurement of the effectiveness of individual test items. An understanding of the factors which govern effectiveness (and a means of measuring them) can enable us to create more effective test questions and also regulate and standardise existing tests. There are three main types of Item Analysis: Item Response Theory, Rasch Measurement and Classical Test Theory. Classical Test Theory (traditionally the main method used in the United Kingdom) utilises two main statistics-Facility and Discrimination. The main problems with Classical Test Theory are that the conclusions drawn depend very much on the sample used to collect information.