A number of ~collections.namedtuple class are used in GTC to return the results of calculations.
named_tuples.VarianceAndDof
named_tuples.VarianceCovariance
named_tuples.StandardUncertainty
named_tuples.StandardDeviation
named_tuples.ComponentOfUncertainty
named_tuples.Influence
named_tuples.CovarianceMatrix
named_tuples.CorrelationMatrix
named_tuples.InterceptSlope