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Contributory Factors

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Contributory Factors

Contributory factors (sometimes known as CFs) are part of the information recorded about crashes under STATS19. They are available for analysis to users of MAST Professional as dimensions.

As there are various ways to use contributory factor dimensions, this Contributory Factors example shows the different approaches to analysing with CFs in MAST.

Available Contributory Factor dimensions

Some contributory factor information is included in all three data cubes ( Crashes, Vehicles and Casualties) in MAST Professional. Full lists of which dimensions are available and what they are called can be found in tables on these pages:

Contributory Factor definitions

Contributory factors definitions are set out in STATS20. There are clearly defined rules on what the contributory factors mean; which parties they are allowed to be attributed to; and in which circumstances they should be used.

Contributory Factors in the Crashes tab

In the Crashes tab, there are all 78 contributory factor dimensions, as defined in STATS20. The available dimensions are in this list.

The dimensions are boolean: they are structured so there is a 'Yes' or 'No' to the question "did this crash have this CF recorded" for each contributory factor. A contributory factor is recorded as 'Yes' when the CF in question was recorded at least once in relation to the crash.

A second level of these dimensions indicates to which type of participant the CF was attributed: driver; passenger; pedestrian; a mixture of participants; or an unknown party.

As ever, the measures on the Crashes tab always refers to the number of crashes and not the number of contributory factors attributed.

Contributory Factors in the Vehicles tab

In the Vehicles tab, there are 69 contributory factor dimensions where a CF was attributed to a vehicle. This includes cases where the contributory factor was attributed to a casualty who can unambiguously be identified as a certain vehicle's driver or rider. The available dimensions are in this list.

The dimensions are boolean: they are structured so there is a 'Yes' or 'No' answer to the question "did this vehicle and/or driver/rider have this CF attributed?" for each contributory factor.

A second level of these dimensions indicates whether or not the vehicle's driver/rider was injured.

As ever, the measures on the Vehicles tab always refers to the number of vehicles and their associated drivers/riders and not the number of contributory factors attributed.

Contributory Factors in the Casualties tab

In the Casualties tab, there are 40 contributory factor dimensions where a CF was attributed to a passenger or pedestrian casualty and an additional 11 dimensions which indicate the involvement of certain CFs by any party or parties in the collision. The available dimensions are in these lists.

The dimensions are boolean: they are structured so there is a 'Yes' or 'No' answer to the question "did this passenger or pedestrian casualty have this CF attributed" for each CF.

A second level of these dimensions indicates the casualty class.

As ever, the measures on the Casualties tab always refers to the number of casualties and not the number of contributory factors attributed.

Uninjured Pedestrians

It is possible under the STATS20 guidance for uninjured pedestrians to contribute to a crash and therefore they can have CFs attributed to them. Certain contributory factors can be attributed to uninjured pedestrians. More information can be found here.

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