spell: Spell statistics

In metno/esd.test: Climate analysis and empirical-statistical downscaling (ESD) package for monthly and daily data.

Description

Statistics of spell durations (consecutive wet and dry days), e.g. dry and wet periods or duration of extremes.

exceedance estimates statistics for peak-over-treshold, and nevents returns the number of events with exceeding values (e.g. the number of rainy days X > 1 mm/day). wetfreq resturs n the wet-day frequency (a fraction) and wetmean wet-day mean.

Usage

spell(x,threshold,...)
spell.default(x,threshold,upper=150,...)
spell.station(x,threshold,upper=150,...)
hist.spell(x, ...)
count(x,threshold=1,fraction=FALSE) 
exceedance(x,threshold=1,fun='mean',...)
exceedance.default(x,threshold=1,fun='mean',...)
exceedance.station(x,threshold=1,fun='mean',...)
exceedance.field(x,threshold=1,fun='mean',...)
nevents(x,threshold=1)
wetfreq(x,threshold=1)
wetmean(x,threshold=1)
HDD(x,x0=18,na.rm=TRUE)
CDD(x,x0=22,na.rm=TRUE)
GDD(x,x0=10,na.rm=TRUE)

Arguments

x	station or field object
threshold	threshold value
upper	upper limit for maximum length - ignore any above this because they are likely errornous
fraction	TRUE: divide the number of counts by number of samples
fun	function

Value

Station or field objects

Author(s)

R.E. Benestad and A. Mezghanil

See Also

plot

Examples

# Example 1 : 
precip <- station.metnod(stid="18700",param="precip")
x <- spell(precip,threshold=.1)
x.ann <- annual(x,FUN="max")
plot(x.ann,plot.type="multiple")
# Example 2 :
x11() ; plot(x)

# Growing degree days:
data(ferder)
plot(as.seasons(ferder,FUN='GDD'))

metno/esd.test documentation built on May 22, 2019, 7:49 p.m.