loss development factor

Loss development factors or LDFs are used in insurance pricing and reserving to adjust claims to their projected ultimate level.{{cite web|url=https://www.irmi.com/online/insurance-glossary/terms/l/loss-development-factor-ldf.aspx|title=loss development factor (LDF) - Insurance Glossary - IRMI.com|publisher=}}{{cite web|url=http://www.investopedia.com/terms/l/loss-development.asp|title=Loss Development Definition - Investopedia|first=Brent|last=Radcliffe|date=26 July 2015|publisher=}} Insurance claims, especially in long-tailed lines such as liability insurance, are often not paid out immediately. Claims adjusters set initial case reserves for claims; however, it is often impossible to predict immediately what the final amount of an insurance claim will be,{{cite web|url=http://www.willis.com/documents/publications/industries/healthcare/Demystifying_Actuarial_Reports_V3.pdf|title=Demystifying Actuarial Reports|first=Brad|last=Norrick|date=January 2012}} due to uncertainty around defense costs, settlement amounts, and trial outcomes (in addition to several other factors). Loss development factors are used by actuaries, underwriters, and other insurance professionals to "develop" claim amounts to their estimated final value. Ultimate loss amounts are necessary for determining an insurance company's carried reserves. They are also useful for determining adequate insurance premiums, when loss experience is used as a rating factor{{cite web|url=http://www.insurancejournal.com/magazines/features/2005/05/23/56160.htm|title=Workers' Comp: An Introductory View into Loss Sensitive Plans|date=23 May 2005|publisher=}}{{cite web|url=https://www.casact.org/pubs/proceed/proceed78/78056.pdf|title=Loss Rating|first=Gary|last=Patrik}}{{cite web|url=https://www.casact.org/pubs/proceed/proceed78/78050.pdf|title=Actuarial Note on Loss Rating|first=Ronald|last=Ferguson}}

Loss development factors are used in all triangular methods of loss reserving,{{cite web|url=http://www.hbactuarial.com/loss-development-factor/|title=Loss Development Factor|date=10 December 2014|publisher=}} such as the chain-ladder method.