skfolio.measures.mean

skfolio.measures.mean(returns, sample_weight=None)

Compute the mean.

Parameters:

returnsndarray of shape (n_observations,) or (n_observations, n_assets)

Array of return values.

sample_weightndarray of shape (n_observations,), optional

Sample weights for each observation. If None, equal weights are assumed.

Returns:

valuefloat or ndarray of shape (n_assets,)

The computed mean. If returns is a 1D-array, the result is a float. If returns is a 2D-array, the result is a ndarray of shape (n_assets,).

Notes

NaN handling: - Unweighted: NaNs are ignored; all-NaN inputs yield NaN. - Weighted: NaNs propagate.