Methods for function flip in package NADA.
When used in concert with Cen, flip
rescales left-censored data into right-censored data
for use in the survival package routines (which can only handle
right-censored data sets).
# S4 method for Cen
flip(x)# S4 method for formula
flip(x)
A Cen or formula object.
Flips, or rescales a Cen object or a formula object.
By default, flip rescales the input data by subtracting a
large constant that is larger than maximum input value from all
observations. It then marks the data as right censored so that
routines from the survival package can be used.
IMPORTANT: All NADA routines transparently handle flipping and
re-transforming data. Thus, flip should almost never be used,
except perhaps in the development of an extension function.
Also, flipping a Cen object results in a Surv object -- which presently cannot be flipped back to a Cen object!
Flipping a formula just symbolically updates the response (which should be a Cen object). Result is like: flip(Cen(obs, cen))~groups