val shuffle : 'a array -> unitval choose : src:'a array -> dst:'a array -> unitval sample : src:'a array -> dst:'a array -> unitval sum : float array -> floatval mean : float array -> floatval var : float array -> float -> floatval std : float array -> float -> floatval absdev : float array -> float -> floatval skew : float array -> float -> float -> floatval kurtosis : float array -> float -> float -> floatval cov : float array -> float array -> float -> float -> floatval corrcoef : float array -> float array -> floatval quantile : float array -> float -> float