add_duration

A <code>data.table</code> containing at least a column <code>time</code>,
which is sortable. For example, could be POSIXct dates.

A character vector for the columns you wish the output table to 
be keyed by.

keys

Should the table be modified and this function return nothing
(silent = TRUE), or should the function return the modified table (silent
= FALSE).

silent

Adds a column <code>duration</code> to a <code>data.table</code> with column <code>time</code>,
the most recent time given a duration of 1, the second most recent time 
given a duration of 2, and so on. This function modifies the input
table.

internal

Detection of anomalous space-time clusters using the scan
statistics methodology. Focuses on prospective surveillance of data streams,
scanning for clusters with ongoing anomalies. Hypothesis testing is made
possible by the generation of Monte Carlo p-values.

add_duration: Add a column `duration` to a `data.table` with column `time`.

Description

Usage

Arguments

Value