Soil contamination: Moving to a world beyond p<0.05?

March 19, 2021

RSK Director, Peter Witherington, spoke at the Royal Statistical Society’s (RSS) latest webinar, “Dr Groundlove – or how I learned to stop worrying and love the Central Limit Theorem” on 1 March. Peter was joined by independent statistician Nigel Marriott, and Ron Wasserstein of the American Statistical Association (ASA), to discuss the new statistics guidance: Comparing Soil Contamination Data with a Critical Concentration.

Peter Witherington

The new guidance was published by CL:AIRE (the industry body for the UK land contamination and remediation sector) in September 2020. The 46-page document advises industry professionals on how to use statistics when assessing land contamination and deciding whether the land is safe for development. RSS fellow and member of its quality improvement section, Nigel Marriott, was the lead author of the guidance. The main change from the previous version is the move away from using probability- (p-) values to using confidence intervals instead. This change was heavily influenced by the ASA statement on p-values published in 2016, so in effect, the UK land-contamination industry became one of the first in the world to move “to a world beyond p<0.05” as Ron Wasserstein suggested in 2019.

“It is great to see that the redrafting of the statistics guidance initiated by RSK has received such international acclaim and that the document has been downloaded over 2000 times,” commented Peter. “The added endorsement by the ASA, considering it to be a ‘first’ in a more pragmatic approach to data, is hugely encouraging. The revised guidance now challenges the user to understand their data in the context of a conceptual site model rather that adopting a ‘bright line test’ that can be misleading. I hope that this will lead to better decisions made on sites that might be contaminated.”

For further information, visit Nigel Marriott’s blog: “Comparing Soil Contamination Data with a Critical Concentration (marriott-stats.com)”. Upcoming RSS events can be found on their website.

📸 #selfiesonsite 🤳

Ryan Dunderdale, Senior Surveyor at Central Alliance, providing technical support and on-site training to datum plate install teams down in Bristol.

Want to join our team? View our latest opportunities 👉 www.rskgroup.com/careers

#RSKgroup #behindthescenes #meettheteam #RSKfamily #RSKonsite #engineering #construction
...

🌟 In the June edition of our #employeespotlight, we spoke with with Rosie Pearce at Stephenson Halliday and Carmen Snowdon at WRc Group to find out about their recent achievements 🏆

👏 Congratulations to you both!

Click the link in our bio to find out more!

#rskfamily #employeeapprecitation #team #landscapeinstitute #instituteofwater #architecture
...

"If you don’t feel valued, represented and respected in your workplace, then inevitably your #wellbeing will suffer.”

📌 In our latest edition of #ADayInTheLife, we spoke with Ellen Lapworth-Maisey, Wellbeing, #Equality, Diversity and Inclusion Manager at RSK – a fascinating position that helps to create an inclusive and empowering #culture for all RSK staff.

Click the link in bio to learn more!

#RSKGroup #RSKfamily #diversity #inclusion #mentalhealth
...

🚶 𝗣𝗲𝗱𝗼𝗺𝗲𝘁𝗲𝗿 𝗖𝗵𝗮𝗹𝗹𝗲𝗻𝗴𝗲 𝟮𝟬𝟮𝟮 𝗰𝗼𝗻𝗰𝗹𝘂𝗱𝗲𝘀 𝗮 𝘀𝘂𝗰𝗰𝗲𝘀𝘀

#RSKSteps came to an end on Tuesday 31 May after a month of stepping adventures.

𝗜𝗻 𝗻𝘂𝗺𝗯𝗲𝗿𝘀:
✔️1449 participants
✔️332,268,416 steps
✔️£1500 raised for our chosen charity, MIND!

Read more about this fantastic challenge in our bio!

#RSKGroup #RSKfamily #wellbeing #health #mentalhealth #walking
...

#RSKEvents

📌 Join Dirk Van Look and Chris Hughes on our webinar all about #PFAS – perfluoroalkyl substances, which are both human-made and known to be harmful to humans.

💡 We will showcase real-life examples to demonstrate how RSK is responding and developing capabilities to assess these emerging #contaminants.

Find out more and register now in our bio!

#RSKGroup #RSKfamily #PFAScontaminants #foreverchemicals #chemicals
...

Copy link
Powered by Social Snap