Definition(s)

Frequency

Number of occurrences of an event per defined period of time or number of trials.

Source:API STANDARD 780, Security Risk Assessment Methodology for the Petroleum and Petrochemical Industries, First Edition, May 2013. Global Standards

Frequency (HZ)

Number of complete cycles of a wave motion per second of time. Unit of measure is called a Hertz.

Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards

 

Frequency

Number of occurrences of an event per defined period of time or number of trials.

Sample Usage:

  1. The frequency of severe hurricanes in the Atlantic Ocean has been observed to be on average four per year.
  2. The frequency of the number three when Bob rolled a six-sided die was one time in six rolls.

Source: DHS Risk Lexicon, U.S. Department of Homeland Security, 2010 Edition. September 2010 Regulatory Guidance

 

Frequency

Number of events (3.5.1.3) or outcomes per defined unit of time. NOTE Frequency can be applied to past events (3.5.1.3) or to potential future events, where it can be used as a measure of likelihood (3.6.1.1)/probability (3.6.1.3).

Source: ISO Guide 73:2009(E/F), Risk Management – Vocabulary, First Edition, 2009. Global Standards

Comments are closed.