setcolsnull

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'.

Joonas Miettinen

popEpi

Functions for Epidemiological Analysis using Population Data

Matti Rantanen

Karri Seppa

setcolsnull function

<dl><dt>DT</dt>
<dd>a <code>data.table</code></dd>
<dt>delete</dt>
<dd>a character vector of column names to be deleted</dd>
<dt>keep</dt>
<dd>a character vector of column names to keep; 
the rest will be removed; <code>keep</code> overrides <code>delete</code></dd>
<dt>colorder</dt>
<dd>logical; if <code>TRUE</code>, also does <code>setcolorder</code> using
<code>keep</code></dd>
<dt>soft</dt>
<dd>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</dd></dl>

Arguments

Author

Delete data.table columns if there — setcolsnull

<dl>

<dt>DT</dt>
<dd>a <code>data.table</code></dd>


<dt>delete</dt>
<dd>a character vector of column names to be deleted</dd>


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


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


<dt>soft</dt>
<dd>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</dd>

</dl>

setcolsnull: Delete `data.table` columns if there

Description

Usage

Value

Arguments

Author