def kappa_analysis_koch(kappa):
    """
    Analysis kappa number with Landis-Koch benchmark.

    :param kappa: kappa number
    :type kappa : float
    :return: strength of agreement as str
    """
    try:
        if kappa < 0:
            return 'Poor'
        if kappa >= 0 and kappa < 0.2:
            return 'Slight'
        if kappa >= 0.2 and kappa < 0.4:
            return 'Fair'
        if kappa >= 0.4 and kappa < 0.6:
            return 'Moderate'
        if kappa >= 0.6 and kappa < 0.8:
            return 'Substantial'
        if kappa >= 0.8 and kappa <= 1:
            return 'Almost Perfect'
        return 'None'
    except Exception:
        return 'None'
