a measure of the degree that an observed result (such as relationship between two variables) is due to chance. Statistical significance is usually expressed as a p-value. A p-value of 0.05, for example, means that the observed result will probably occur as a result of chance only 5% of the time.

rules for including/excluding human subjects in research. Subject selection should be equitable, i.e. subjects should be included or excluded for legitimate scientific or ethical reasons. For example, a clinical trial might exclude subjects who do not have the disease under investigation or are too sick to take part in the study safely. See Risk minimization, Justice.

see Legal authorized representative.