Describing Multidimensional Data
#Statistics #Basics #Covariance
Descriptions of Multidimensional Data
Dispersion Matrix
As defined in Correlation Coefficient and Covariance for Numeric Data, covariance is about the variance of two series. This property makes it easy to generalize it to multidimensional data.
The generalized quantity is named as dispersion matrix. Suppose we have a $p$ dimensional dataset $X$,
index  $x_1$  $x_2$  …  $x_p$ 

1  2.3  12.3  83.2  9.3 
…  …  …  …  … 
N  3.1  5.6  23.6  8.2 
We could then calculate the pairwise covariance between the different dimensions.
$x_1$  $x_2$  …  $x_p$  

$x_1$  
$x_2$  
…  
$x_p$ 
Published:
by L Ma;
L Ma (2018). 'Describing Multidimensional Data', Datumorphism, 12 April. Available at: https://datumorphism.leima.is/wiki/statistics/multidimensionaldata/.
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