bulletin17c_analysis

bulletin17c_analysis(
    data,
    uncertainty_method='MultivariateNormal',
    output_length=10000,
    seed=12345,
    confidence_level=0.9,
    exceedance_probabilities=None,
)

Bulletin 17C (log-Pearson Type III) flood-frequency analysis.

Fit the model by the generalized method of moments and return the Cohn-style delta-method confidence intervals, the fitted parameters, and the sandwich covariance.

Parameters

Name	Type	Description	Default
data	array_like	Annual peak observations.	required
uncertainty_method	str	Uncertainty-quantification method: "MultivariateNormal", "Bootstrap", "LinkedMultivariateNormal", or "BiasCorrectedBootstrap".	"MultivariateNormal"
output_length	int	Number of parameter-set draws used for uncertainty quantification.	10000
seed	int	PRNG seed for the uncertainty draw.	12345
confidence_level	float	Confidence level for the intervals.	0.90
exceedance_probabilities	array_like of float	Exceedance probabilities at which to tabulate the curve; when None, the default ordinates are used.	None

Returns

Name	Type	Description
	dict	Keys exceedance_probabilities, point_estimates, lower_ci, upper_ci, confidence_level, beta1, nu, quantile_variance, parameters, and covariance (a nested p x p list).