A test of whether the null hypothesis of independent observations with a constant variance is valid. This hypothesis is of particular concern in the analysis of longitudinal data, where the k repeated measures of individuals may display a noticeable correlation. The most common test is the Mauchly test, for which the test statistic is W, given by
where S is the k × k variance-covariance matrix for the sample, and det(S) and tr(S) are, respectively, the determinant and the trace of S.
- one-port
- one-pot synthesis
- ONERA
- one-shot
- one-shot multivibrator
- one-sided abrupt junction
- one-sided confidence interval
- one-sided hypothesis
- Onesquethawian
- one-tailed test
- one-tail probability
- one-time pad
- one-time password
- one-to-one correspondence
- one-to-one function
- one-to-one onto function
- O-network
- one-way filter
- one-way function
- one-way light time
- one-way linked list
- one-way travel time
- one-way valve
- one‐sided surface
- one‐sided test