There are two types of reliability – internal and external reliability internal reliability assesses the consistency of results across items within a test external reliability refers to the extent to which a measure varies from one use to another.
Research methods in psychology chapter 5: psychological measurement reliability and validity of measurement learning objectives define reliability, including the different types and how they are assessed define validity, including the different types and how they are assessed. Types there are several general classes of reliability estimates: inter-rater reliability assesses the degree of agreement between two or more raters in their appraisals test-retest reliability assesses the degree to which test scores are consistent from one test administration to the next measurements are gathered from a single rater who uses the same methods or instruments and the same.
Types of reliability test-retest reliability is a measure of reliability obtained by administering the same test twice over a period of time to a group of individuals the scores from time 1 and time 2 can then be correlated in order to evaluate the test for stability over time. Test validity and reliability whenever a test or other measuring device is used as part of the data collection process, the validity and reliability of that allpsych research methods chapter 73 test validity and construct validity is the term given to a test that measures a construct accurately and there are different types of. Test-retest reliability used to assess the consistency of a measure from one time to another parallel-forms reliability used to assess the consistency of the results of two tests constructed in the same way from the same content domain internal consistency reliability used to assess the consistency of results across items within a test.
Reliability is a measure of the consistency of a metric or a method every metric or method we use, including things like methods for uncovering usability problems in an interface and expert judgment, must be assessed for reliability in fact, before you can establish validity, you need to establish. Because of this, there a variety of different types of reliability that each have multiple ways to estimate reliability for that type in the end, it's important to integrate the idea of reliability with the other major criteria for the quality of measurement -- validity -- and develop an understanding of the relationships between reliability.