setcolsnull

a character vector of column names to be deleted

delete

a character vector of column names to keep; 
the rest will be removed; <code>keep</code> overrides <code>delete</code>

keep

logical; if <code>TRUE</code>, also does <code>setcolorder</code> using
<code>keep</code>

colorder

logical; if <code>TRUE</code>, does not cause an error if any variable
name in <code>keep</code> or <code>delete</code> is missing; <code>soft = FALSE</code> useful 
for programming sometimes

soft

Deletes columns in a <code>data.table</code> conveniently.
May only delete columns that are found silently. Sometimes useful in e.g.
<code>on.exit</code> expressions.

Enables computation of epidemiological statistics, including those
where counts or mortality rates of the reference population are used.
Currently supported: excess hazard models (Dickman, Sloggett, Hills, and
Hakulinen (2012) <doi:10.1002/sim.1597>), rates, mean survival times,
relative/net survival (in particular the Ederer II (Ederer and Heise (1959))
and Pohar Perme (Pohar Perme, Stare, and Esteve
(2012) <doi:10.1111/j.1541-0420.2011.01640.x>) estimators),
and standardized incidence and mortality ratios,
all of which can be easily adjusted for by covariates such as
age. Fast splitting and aggregation of 'Lexis' objects (from package 'Epi')
and other computations achieved using 'data.table'.

setcolsnull: Delete `data.table` columns if there

Description

Usage

Arguments

Value