comp_irstats: Compute flow intermittence statistics
In messamat/globalIRmap: What the Package Does (One Line, Title Case)

Description Usage Arguments Value

Format and compute a set of summary statistics based on a yearly streamflow gauging station time series. Used in comp_GRDCdurfreq.

1	comp_irstats(tabyearly, maxgap, mdurthresh, yearthresh, windowsize, fullwindow)

`tabyearly`	data.table
`maxgap`	(integer) maximum number of days with missing data beyond which a year is not used in the computation of statistics.
`mdurthresh`	(numeric) threshold of mean annual number of zero-flow days beyond which to classify gauge as intermittent.
`yearthresh`	(integer) minimum year from which to analyze discharge record.
`windowsize`	(integer) window size to check for zero-flow days.
`fullwindow`	(logical) whether years for which the window is truncated (e.g., beginning and end of time series) are taken in account in moving window analysis.

link[data.table]data.table with 1 row and 10 columns:

firstYear_kept: the first year in the time series with a number of missing daily values <= maxgap (i.e., the first year in the subset of the time series kept for further analysis)
lastYear_kept: the last year in the time series with a number of missing daily values <= maxgap (i.e., the first year in the subset of the time series kept for further analysis)
totalYears_kept: total number of years in the time series with a number of missing daily values <= maxgap (i.e., the number of years in the subset of the time series kept for further analysis)
totaldays: total number of days with data in years with a number of missing daily values <= maxgap (i.e., total number of days of data kept for further analysis)
integerperc: proportion of daily values which are in integer format. Only including years with <= maxgap missing daily discharge values.
sumDur: total number of daily zero-flow values. Only including years with <= maxgap missing daily discharge values.
mDur: mean annual number of daily zero-flow values. Only including years with <= maxgap missing daily discharge values.
mFreq: mean annual frequency of zero flow events. A zero-flow event is defined as one or more consecutive days with a recorded daily discharge of zero. Only including years with <= maxgap missing daily discharge values.
intermittent: binary flow intermittence class. 1: non-perennial (if mDur >= 1, i.e., if gauging station recorded zero-flow for at least one day per year on average); 0: perennial.
movinginter: whether there is at least one zero-flow day in every windowsize-year (e.g., 20-year) moving window across the record.