findevents: Find events
In AnderWilson/smurf: Some Useful R Functions

Description Usage Arguments Value Author(s)

This function finds events (e.g. heat waves or ozone events). The approach is to find consecutive days that are above a thresholds.

1	findevents(date, x, xmin, mindays = 2, by)

`date`	A vector of dates.
`x`	The exposure variable (e.g. temperature for heat waves or ozone for ozone events)
`xmin`	The minimum value that x must be for at least mindays to qualify as an event.
`mindays`	The minimum number of consecutive days that qualify as an event.
`by`	A vector of ids or a matrix with columns as the id variables. The events will be found separately within each unique combination of id variables. This is optional.

Returns a data.table with the columns for by, x, date as well as the following new variables: above and indivator the x>xmin; above_fromstart number of consecutive days that have exceeded xmin through the current date; above_toend the number of remaining days that are above xmin; length the total number of consecutive days that are above xmin; event a logical indivatring a day is part of an event.

Ander Wilson

AnderWilson/smurf documentation built on May 5, 2019, 4:57 a.m.