NationMaster - Encyclopedia: Mean vector

The mean vector consists of the means of each variable and the variance-covariance matrix consists of the variances of the variables along the main diagonal and the covariances between each pair of variables in the other matrix positions. For more information click on the link. http://www.itl.nist.gov/div898/handbook/pmc/section5/pmc541.htm

Results from FactBites:

Mean electrical axis (573 words)
	The mean electrical axis is the average of all the instantaneous mean electrical vectors occurring sequentially during depolarization of the ventricles.
	This causes the septum to depolarize from left-to-right as depicted by vector 1.
	After another 20 milliseconds later, the mean vector is pointing toward the left arm and anterior chest as the free wall of the ventricle depolarizes from the endocardial to the epicardial surface (vector 3).

White noise - Wikipedia, the free encyclopedia (1350 words)
	I.e., it is a zero mean random vector, and its autocorrelation matrix is a multiple of the identity matrix.
	To simulate an arbitrary random vector, we transform a white random vector with a carefully chosen matrix.
	We choose the transformation matrix so that the mean and covariance matrix of the transformed white random vector matches the mean and covariance matrix of the arbitrary random vector that we are simulating.

More results at FactBites »

COMMENTARY

Share your thoughts, questions and commentary here

Want to know more?
Search encyclopedia, statistics and forums:

Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms.