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CrossValidation 

CrossValidation(
    actual: ndarray, estimate: ndarray, variance: ndarray
)

Cross-validation results; NaN where a sample had too few neighbors.

slope property 

slope

Slope of the regression of actual on estimated values; below 1 means conditional bias.

standardized_squared_error property 

standardized_squared_error

Mean of error² / variance; near 1 when the kriging variance is calibrated.