Convert an object to "wide" or "long" form.
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An object of class
Additional arguments (not implemented).
data.table is returned,
with the data in 'wide' or 'long' format.
There is one row for each time point.
ten object generated from a
this has columns:
number of events.
number at risk.
If derived from a
there are additional columns for
for each covariate group.
Most methods for
ten objects are designed for the 'long' form.
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