Q95: Qxx, Q95, Q90, Q70

In lfstat: Calculation of Low Flow Statistics for Daily Stream Flow Data

Description

Calculates the quantiles of an object of class 'lfobj'.

Usage

Qxx(lfobj, Qxx, year = "any", monthly = FALSE, yearly = FALSE,
breakdays = NULL, na.rm = TRUE)

Q95(lfobj, year = "any", monthly = FALSE, yearly = FALSE,
breakdays = NULL, na.rm = TRUE)

Q90(lfobj, year = "any", monthly = FALSE, yearly = FALSE,
breakdays = NULL, na.rm = TRUE)

Q70(lfobj, year = "any", monthly = FALSE, yearly = FALSE,
breakdays = NULL, na.rm = TRUE)

Arguments

lfobj	An object of class "lfobj"
Qxx	The quantile to calculate, e.g. 70 would refer to Q70
year	The year for which the Q95 should be computed. If hyearstart != 1 the Q95 is calculated for the hydrological year! "any" means the whole series should be taken.
monthly	logical - Should the Q95 be calculated separately for every month?.
yearly	logical - If TRUE, the Q95 is calculated for each hydrological year separately.
breakdays	A vector of breakdays if the Q95 should be calculated for different seasons.
na.rm	Should NA's be ignored?

Details

If breakdays is a single day, e.g. "01/06", the start of the hydrological year is taken as the second breakday. If more than two seasons are to be specified, a vector of all breakdays is needed.

Value

A length one vector giving the Q95 for the whole series or the specified year. If yearly is true, a vector of the annual Q95s is returned. If breakdays are specified, the values are separated per season.

Author(s)

Daniel Koffler and Gregor Laaha

References

Gustard, A. & Demuth, S. (2009) (Eds) Manual on Low-flow Estimation and Prediction. Operational Hydrology Report No. 50, WMO-No. 1029, 136p.

See Also

MAM

Examples

data(ngaruroro)
Q95(ngaruroro)
Q95(ngaruroro, breakdays = c("01/11","01/05"))
Q95(ngaruroro, year = 1991)
#Calculate Q99
Qxx(ngaruroro, Qxx = 99)

Example output

Loading required package: xts
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Loading required package: lmom
Loading required package: lattice
   Q95 
4.4303 
   Q95 
4.4303 
   Q95 
4.3602 
    Q99 
3.35809 

lfstat documentation built on May 2, 2019, 6:07 p.m.