unLexis: Remove Lexis attributes from a 'Lexis' object.

In Epi: Statistical Analysis in Epidemiology

Remove Lexis attributes from a Lexis object.

Description

Removes the Lexis attributes, including the class Lexis from a Lexis object.

Usage

unLexis(Lx)

Arguments

Lx	A Lexis object

Value

The input object with "Lexis" removed from the class attribute.

Author(s)

Bendix Carstensen

See Also

Lexis

Examples

# A small bogus cohort
xcoh <- structure(list( id = c("A", "B", "C"),
                     birth = c("14/07/1952", "01/04/1954", "10/06/1987"),
                     entry = c("04/08/1965", "08/09/1972", "23/12/1991"),
                      exit = c("27/06/1997", "23/05/1995", "24/07/1998"),
                      fail = c(1, 0, 1) ),
                    .Names = c("id", "birth", "entry", "exit", "fail"),
                 row.names = c("1", "2", "3"),
                     class = "data.frame")

# Convert the character dates into numerical variables (fractional years)
  xcoh <- cal.yr(xcoh, format="%d/%m/%Y", wh=2:4)
# xcoh <- cal.yr(xcoh, format="%d/%m/%Y", wh=2:4)

# Define a Lexis object with timescales calendar time and age
Lcoh <- Lexis(entry = list(per = entry ),
               exit = list(per = exit,
                           age = exit - birth),
        exit.status = fail,
               data = xcoh)
summary(Lcoh)
try(summary(unLexis(Lcoh)))

Epi documentation built on Oct. 1, 2024, 5:07 p.m.