Rating aggregation flawed, but better than nothing, researchers say
New research finds errors still substantial even after combining ratings
Aggregating credit ratings from different providers might seem a good way to come up with more reliable estimates of default risk, but new analysis suggests it does not work well in practice.
Christoph Lehmann and Daniel Tillich of the Dresden University of Technology in Germany tested the effects of aggregation with a simulated debt market, including 4,000 issuers of differing credit quality and three rating agencies, each using the same internal model but with access to different, overlapping
Only users who have a paid subscription or are part of a corporate subscription are able to print or copy content.
To access these options, along with all other subscription benefits, please contact info@risk.net or view our subscription options here: http://subscriptions.risk.net/subscribe
You are currently unable to print this content. Please contact info@risk.net to find out more.
You are currently unable to copy this content. Please contact info@risk.net to find out more.
Copyright Infopro Digital Limited. All rights reserved.
As outlined in our terms and conditions, https://www.infopro-digital.com/terms-and-conditions/subscriptions/ (point 2.4), printing is limited to a single copy.
If you would like to purchase additional rights please email info@risk.net
Copyright Infopro Digital Limited. All rights reserved.
You may share this content using our article tools. As outlined in our terms and conditions, https://www.infopro-digital.com/terms-and-conditions/subscriptions/ (clause 2.4), an Authorised User may only make one copy of the materials for their own personal use. You must also comply with the restrictions in clause 2.5.
If you would like to purchase additional rights please email info@risk.net
More on Risk management
Op risk data: Payday lender Skytrail sees $1.4bn disappear
Also: Cartel claims cost European bond dealers dearly, plus oil price gouging and crypto cover-ups. Data by ORX News
Bankers hope EBA op risk taxonomy will go global
Proposed update to 20-year-old risk map is welcomed, but international co-ordination urged
Marex plots interest rate clearing push
UK broker is live on LCH and plans to be a “day one” clearing member on FMX
Eurex default fund reshuffle leaves members frustrated
Clearing members say concentration margin add-ons would be fairer than buffer on all portfolios
Tired of fat-finger blunders, G-Sibs turn to robots for help
Big banks speed up shift towards control automation and AI adoption to counter costly human errors, Benchmarking survey finds
CME, FICC in talks to expand cross-margining to client accounts
New rules and account structures will be needed to allow cross-margining by non-members
On geopolitical risk, G-Sibs choose their battles
Conflicts – both existing and threatened – raise concern among banks, but many are still grappling to weave the risk into their frameworks
Margin calls jumped threefold as global markets sold off
FCMs claim no client defaults, but episode revives complaints of procyclical margining