flood (version 0.1.1)

confInt_sTL: Estimated confidence intervals using sTL

Description

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

Usage

confInt_sTL(x1, x2, p, j = 1, alpha = 0.05)

Arguments

x1

vector or matrix of observations from season 1 (rows: observations, columns: stations).

x2

vector or matrix of observations from season 2 (rows: observations, columns: stations).

p

a probability.

j

quantile and parameter estimation for the jth station (jth column of x). Irrelevant if is x1 and x2 are vectors.

alpha

confidence level for confidence interval.

Value

List of

• ci confidence interval.
• quant estimated quantile from a two-component GEV using trimmed L-moments (leftrim=0, rightrim=1).
• var variance of the estimated quantile.

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
confInt_sTL(x1=x1, x2=x2, p=0.95, alpha=0.05)

# Seasonal observations of 100 years at 4 stations:
x1 <- matrix(rgev(400, 2, 1, 0.3), ncol=4)
x2 <- matrix(rgev(400, 4, 1, 0.2), ncol=4)
confInt_sTL(x1=x1, x2=x2, j=2, p=0.95, alpha=0.05)