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Sets or retrieves the "units"
attribute of an object.
For units.default
replaces the builtin
version, which only works for time series objects. If the variable is
also given a label
, subsetting (using [.labelled
) will
retain the "units"
attribute. For a Surv
object,
units
first looks for an overall "units"
attribute, then
it looks for units
for the time2
variable then for time1
.
units(x, …)
# S3 method for default
units(x, none='', …)
# S3 method for Surv
units(x, none='', …)
# S3 method for default
units(x) <- value
any object
ignored
the units of the object, or ""
value to which to set result if no appropriate attribute is found
the units attribute of x, if any; otherwise, the units
attribute of
the tspar
attribute of x
if any; otherwise the value
none
. Handling for Surv
objects is different (see above).
# NOT RUN {
fail.time <- c(10,20)
units(fail.time) <- "Day"
describe(fail.time)
S <- Surv(fail.time)
units(S)
label(fail.time) <- 'Failure Time'
fail.time
# }
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