Statistical reliability

difference between a measured quantity value and a reference quantity value

Reproducibility, closely related to replicability and repeatability, is a major principle underpinning the scientific method. For the findings of a study to be reproducible means that results obtained by an experiment or an observational study or in a statistical analysis of a data set should be achieved again with a high degree of reliability when the study is replicated. There are different kinds of replication but typically replication studies involve different researchers using the same methodology. Only after one or several such successful replications should a result be recognized as sci

consistency of a measure in psychometrics and statistics, that is if it produces similar results under consistent conditions

statistical measure of reliability

Repeatability or test–retest reliability is the closeness of the agreement between the results of successive measurements of the same measure, when carried out under the same conditions of measurement. In other words, the measurements are taken by a single person or instrument on the same item, under the same conditions, and in a short period of time. A less-than-perfect test–retest reliability causes test–retest variability. Such variability can be caused by, for example, intra-individual variability and inter-observer variability. A measurement may be said to be repeatable when this variatio

ongoing methodological crisis in science stemming from failure to replicate many studies

paradigm for the design, analysis, and scoring of tests

Theory in psychometrics

absence of self-contradictions

error that varies in sign and magnitude from an observation to another

formula relating psychometric reliability

Measures in psychometrics