Units Attribute of a Vector
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, ...) ## Default S3 method: units(x, none='', ...) ## S3 method for class 'Surv' units(x, none='', ...) ## Default S3 replacement method: units(x) <- value
x |
any object |
... |
ignored |
value |
the units of the object, or "" |
none |
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).
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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