causes: Causes of crashes.
In nacnudus/nzcrash: New Zealand Motor Vehicle Crash Data

Description Usage Format Source See Also

A dataset of 888072 crash causes, recorded by the New Zealand Transport Agency (NZTA) as being causes of crashes in the crashes dataset. There is a many-to-one relationship between causes and crashes. They can be joined by the common column id (see the example below). Alternatively, each cause can be associated with a specific vehicle in each crash, by first joining the vehicles dataset to the crashes one, and then joining the causess dataset by the two common columns id and vehicle_id.

Other attributes in a many-to-one relationship with the crashes are available in the datasets vehicles, and objects_struck.

causes

A data frame with 888072 rows and 7 variables:

id: Unique number identifying the crash, by which the link{crashes} table can be joined.
index: Unique identifier of the cause of each crash (unique in combination with id.
code: Identifier of cause in the data dictionary.
vehicle_id: Vehicle in the crash with which the cause is associated.
cause: Description of the cause.
cause_category: Highest-level group to which the cause belongs.
cause_subcategory: Lowest-level group to which the cause belongs.