Epi (version 1.1.20)

start.Lexis: Time series methods for Lexis objects

Description

Extract the entry time, exit time, status, or duration of follow-up from a Lexis object.

Usage

entry(x, time.scale = NULL)
exit(x, time.scale = NULL)
status(x, at="exit")
dur(x)

Arguments

x

an object of class Lexis.

time.scale

a string or integer indicating the time scale. If omitted, all times scales are used.

at

string indicating the time point(s) at which status is to be measured.

Value

• The entry and exit functions return a vector of entry times and exit times, respectively, on the requested time scale. If multiple time scales are requested, then a matrix is returned.

  The status function returns a vector giving the status at entry or exit and dur returns a vector with the lengths of the follow-up intervals.

See Also

Lexis