Actuarium

State Farm Mut Grp — Commercial Auto

Schedule P Part 3B — net commercial auto liability, 1988–1997 accident years. GRCODE 1767 (State Farm Mut Grp). Values in $000s, net earned premium and net losses.

Actual outcome known

Source: CAS Loss Reserve Database (Meyers & Shi), NAIC Schedule P. Meyers, G.G. and Shi, P. (2011). The Retrospective Testing of Stochastic Loss Reserve Models. CAS E-Forum, using data pulled from NAIC Schedule P Parts 1-4, 1988-1997.

Accident year1988198919901991199219931994199519961997
Net earned premium ($000)286,378308,908326,503332,616341,890355,840379,781398,755406,609406,516

Paid loss triangle, cumulative ($000), as-of 1997

AY \ Age12345678910
198854,699108,337143,899164,818179,538185,391188,023189,759190,520193,499
198960,091119,366151,151174,665185,469192,213196,152198,013199,997
199065,860130,803172,390197,977210,230219,267222,428224,078
199161,946121,108158,880182,689195,247201,854204,911
199265,043128,550164,433187,508199,823208,008
199372,295144,579185,446208,388219,345
199481,988151,197189,630212,446
199583,207152,470190,974
199679,699143,590
199775,827

Incurred loss triangle, cumulative ($000), as-of 1997

AY \ Age12345678910
1988172,262180,112187,158188,775190,569190,701190,344191,752192,087194,099
1989192,154198,550196,977197,877198,265198,957200,108200,044201,101
1990215,766218,769222,694225,682226,110226,247226,698226,739
1991208,425207,219207,811211,186210,054208,456207,581
1992216,172217,665216,400214,510212,937214,979
1993237,378237,679237,253233,699231,958
1994249,592248,849242,493243,140
1995256,434249,225238,468
1996237,860227,353
1997220,029

Realized paid-loss square, all 10 development lags ($000)

AY \ Age12345678910
198854,699108,337143,899164,818179,538185,391188,023189,759190,520193,499
198960,091119,366151,151174,665185,469192,213196,152198,013199,997200,480
199065,860130,803172,390197,977210,230219,267222,428224,078224,855225,430
199161,946121,108158,880182,689195,247201,854204,911205,535206,051206,719
199265,043128,550164,433187,508199,823208,008210,925213,006214,097214,524
199372,295144,579185,446208,388219,345225,981230,040231,594232,739233,365
199481,988151,197189,630212,446229,511237,406240,779242,463242,860244,280
199583,207152,470190,974212,923226,193233,723237,024237,748239,596240,184
199679,699143,590184,346206,780224,327233,298237,216236,725236,825237,368
199775,827143,120184,965206,565220,052225,837229,414230,996230,301230,775

Realized incurred-loss square, all 10 development lags ($000)

AY \ Age12345678910
1988172,262180,112187,158188,775190,569190,701190,344191,752192,087194,099
1989192,154198,550196,977197,877198,265198,957200,108200,044201,101201,380
1990215,766218,769222,694225,682226,110226,247226,698226,739226,744226,263
1991208,425207,219207,811211,186210,054208,456207,581207,273206,990207,092
1992216,172217,665216,400214,510212,937214,979214,145214,513214,899215,141
1993237,378237,679237,253233,699231,958232,944233,677233,264233,786233,698
1994249,592248,849242,493243,140242,907244,737244,854243,805243,678244,692
1995256,434249,225238,468236,970239,422241,843241,497240,784241,707241,793
1996237,860227,353231,394232,722238,184240,732240,776238,824238,056237,781
1997220,029226,968228,101230,540232,679234,313233,572232,942231,590232,101

Hindsight test: chain-ladder vs. realized outcome

A volume-weighted chain-ladder projection from the 1997 upper triangle, compared against the actual realized ultimate now that the full square is known.

Accident yearAge at 1997Projected ultimateRealized ultimateError %
198810193,499193,4990.0%
19899203,124200,4801.3%
19908229,193225,4301.7%
19917211,401206,7192.3%
19926218,032214,5241.6%
19935238,547233,3652.2%
19944246,282244,2800.8%
19953252,280240,1845.0%
19962243,622237,3682.6%
19971247,080230,7757.1%
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