Wikipedia:Articles for deletion/Covariance mapping
Isn't this just the covariance matrix? Their definition is \mathbf{cov}(\mathbf{Y},\mathbf{X}) = \langle \mathbf{YX} \rangle - \langle \mathbf{Y} \rangle \langle \mathbf{X} \rangle,  with \mathbf{Y} the transpose of the row vector \mathbf{X}. So the (i,j)-th entry in their matrix is \langle x_i x_j \rangle - \langle x_i \rangle \langle x_j \rangle. In addition, chunks of the content were copied from http://iopscience.iop.org/article/10.1088/0953-4075/49/15/152004 this article, which is Open Access but uses a different license than Wikipedia does. I ''think'' this is technically disallowed under our copyright policy (the attribution is lost, for one thing), and it certainly intensifies the  concerns
— User:XOR, 16:49, 20 September 2018 (UTC)
Stance: delete
Cited policy: WP:COI (Wikipedia:Conflict of interest)