confInt_TL: Estimated confidence intervals using TL

In flood: Statistical Methods for the (Regional) Analysis of Flood Frequency

Description

Estimated regional (or local) (1-alpha)-confidence intervals for an estimated quantile by using annual TL(0,1)-moments (TL).

Usage

confInt_TL(x, p, j = 1, alpha = 0.05)

Arguments

x	vector or matrix of annual observations.
p	a probability.
j	quantile and parameter estimation for the jth station (jth column of x). Irrelevant if is x is a vector.
alpha	confidence level for confidence interval.

Value

List of

• ci confidence interval.

• quant estimated quantile from a GEV using trimmed L-moments (leftrim=0, rightrim=1).

Examples

library("evd")
# Seasonal observations of 80 years at one station:
x1 <- rgev(80, 2, 1, 0.2) # observations from season 1
x2 <- rgev(80, 3, 1, 0.3) # observations from season 2
x <- seas2ann(x1, x2) # calculaes annual maxima of the two seasons
confInt_TL(x=x, p=0.95, alpha=0.05)

# Seasonal observations of 100 years at 4 stations:
x1 <- matrix(rgev(400, 2, 1, 0.3), ncol=4) # observations from season 1
x2 <- matrix(rgev(400, 2, 1, 0.2), ncol=4) # observations from season 2
x <- seas2ann(x1, x2) # calculaes annual maxima of the two seasons
confInt_TL(x=x, j=2, p=0.95, alpha=0.05)

flood documentation built on May 2, 2019, 4:04 p.m.