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Low-level callback functions

# scipy.stats.gaussian_kde.covariance_factor

`gaussian_kde.``covariance_factor`()

  Computes the coefficient (kde.factor) that multiplies the data covariance matrix to obtain the kernel covariance matrix. The default is `scotts_factor`. A subclass can overwrite this method to provide a different method, or set it through a call to kde.set_bandwidth.