statsmodels.stats.dist_dependence_measures.distance_covariance¶
- statsmodels.stats.dist_dependence_measures.distance_covariance(x, y)[source]¶
Distance covariance.
Calculate the empirical distance covariance as described in [1].
- Parameters
- xarray_like, 1-D or 2-D
If x is 1-D than it is assumed to be a vector of observations of a single random variable. If x is 2-D than the rows should be observations and the columns are treated as the components of a random vector, i.e., each column represents a different component of the random vector x.
- yarray_like, 1-D or 2-D
Same as x, but only the number of observation has to match that of x. If y is 2-D note that the number of columns of y (i.e., the number of components in the random vector) does not need to match the number of columns in x.
- Returns
float
The empirical distance covariance between x and y.
References
- 1
Szekely, G.J., Rizzo, M.L., and Bakirov, N.K. (2007) “Measuring and testing dependence by correlation of distances”. Annals of Statistics, Vol. 35 No. 6, pp. 2769-2794.
Examples
>>> from statsmodels.stats.dist_dependence_measures import ... distance_covariance >>> distance_covariance(np.random.random(1000), np.random.random(1000)) 0.007575063951951362