Probability density function
Culvert, screen and outfall manual, (CIRIA C786) published by CIRIA in 2019, defines probability density function (PDF) as: ‘The mathematical function that describes the relative chance of observing values of a continuous variable. For example, a probability density function could describe the chance that the measured river flow could equal a certain value (for example 100 m³/s), or the chance that a single culvert has a certain percentage blockage.’
Climate Change 2021, The Physical Science Basis, published by the Intergovernmental Panel on Climate Change in 2021, states: ‘A probability density function is a function that indicates the relative chances of occurrence of different outcomes of a variable. The function integrates to unity over the domain for which it is defined and has the property that the integral over a sub-domain equals the probability that the outcome of the variable lies within that sub-domain. For example, the probability that a temperature anomaly defined in a particular way is greater than zero is obtained from its PDF by integrating the PDF over all possible temperature anomalies greater than zero. Probability density functions that describe two or more variables simultaneously are similarly defined.’
[edit] Related articles on Designing Buildings
- Berm.
- Bund.
- CIRIA.
- Culvert.
- Flood.
- Probability.
- River.
- Screen.
- Swales.
- Watercourse.
- Watercourse screen.
Featured articles and news
International Women's Day 8 March, 2025
Accelerating Action for For ALL Women and Girls: Rights. Equality. Empowerment.
Lack of construction careers advice threatens housing targets
CIOB warning on Government plans to accelerate housebuilding and development.
Shelter from the storm in Ukraine
Ukraine’s architects paving the path to recovery.
BSRIA market intelligence division key appointment
Lisa Wiltshire to lead rapidly growing Market Intelligence division.
A blueprint for construction’s sustainability efforts
Practical steps to achieve the United Nations Sustainable Development Goals.
Timber in Construction Roadmap
Ambitious plans from the Government to increase the use of timber in construction.
ECA digital series unveils road to net-zero.
Retrofit and Decarbonisation framework N9 launched
Aligned with LHCPG social value strategy and the Gold Standard.
Competence framework for sustainability
In the built environment launched by CIC and the Edge.
Institute of Roofing members welcomed into CIOB
IoR members transition to CIOB membership based on individual expertise and qualifications.
Join the Building Safety Linkedin group to stay up-to-date and join the debate.
Government responds to the final Grenfell Inquiry report
A with a brief summary with reactions to their response.
A brief description and background to this new February law.
Everything you need to know about building conservation and the historic environment.
NFCC publishes Industry White Paper on Remediation
Calling for a coordinated approach and cross-departmental Construction Skills Strategy to manage workforce development.
'who blames whom and for what, and there are three reasons for doing that: legal , cultural and moral"