virsight hearing - Motor Vehicle Hazard Archive Project
virsight hearing - Motor Vehicle Hazard Archive Project
virsight hearing - Motor Vehicle Hazard Archive Project
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Failure Analysis Ar €ndh..rin8 coNultjnS fm, Feilure Aldysb A!dod!4s (rdl, .lso<br />
revierrd lh€ ||rsB study ad issu€d a EDon ciaiol of th. Bo&d s d.ta<br />
@l€did ploc€du6 sd the way the data @E prt .nt d." rd intervisped<br />
nr$ fi€ld staff &d wahin8ron officiab, udert@l a detailed<br />
airtysi! of the full tu.d of the a.cidents in \E3 s s4ple dd con<br />
tlat d *rs8 s dala with orher d.rabas. FA beli€ve tnat liN s c4<br />
s.ridst3 _e a sioEly bi&s.d lel6tion which is 6Fp.€*nt3ti!e of<br />
dy poDubdon of mot r vehicl€ ..iidents in th€ Unikd StaFs F4<br />
furd! tllat Mrs, violated its oh !€l€ciion citeae in cil4ins cas for<br />
invBtigation, .*ived a b'aed d[tlibution of cas w)th $m€ .egnB<br />
reporimg only very *ve.€ rcdents, ed *lfttiwely iSnor€d peltinent<br />
jnfomalion.n the.ccidents ir inl6tie8ted that *a readily available.<br />
D.tabe en$i6 o$ $e addent3 in ihe \"rsu smlie r$rradid !h€<br />
Bo6rd's aenton that pouce mi..slortirS ma!6 it impcsbl€ lo delernnrE<br />
belt eifectvffi tnrdrgh *tthdcd dslysis of ldge accident<br />
F.] not6 thar }.Tsa ,naltzed inforutjon frcm 30 c€e vehrcl€. In 30<br />
a.ldents (rhe 26 with hlbelted ocap&t3 ud 4 orhs rh" 8.ed lrler<br />
sdded for ompeatfue purF36), but omit8 Eults lrom 26 other [nmce)<br />
vehiclA involv€d in th€!. &aidents beoe they railed t met<br />
one or more ot th€ *lection 6iteria. But, .drdnS to Pd^. N"rsB dtd rcl<br />
oNsr4ntly adhere to itr el.r-tion c.tttria. For exmple, a r 96? Pontia.<br />
E included $ a ce lehicle ddpite the wrsB s stated crit€rion .hat<br />
vehi.l6 wer€ supD6€d t be FxalST4 models.In ddiuon, althouSh<br />
N'rsB claimed rhar irs inr€rr3.tion tEf,.n i! ihe fall ol 1984, *vsd ci.e<br />
.ccidents €srred ir the lat€ sp.ing &d s|jrMe. ot 1984.<br />
Fd fMd Lh.t the dbtriburion ol edenr reporrl,rg by the l"tsB<br />
regional ofi|rr w$ highly skryed wilh adveE oruequdB ror the<br />
replentrrivens of tlE NISD sanple ThE regioN Epo.t€d only fsLl<br />
ui(ienB whne the otl6 epo.ted lrc y nonla(lr oE. A sttlbti.d<br />
rst showed lhrt the od& of Lhis distribucoh o@niru by ch8re &e<br />
l* rhu I m 200. TIE impli€tion il thtt diff€Ma ,i.ld offis interpreiel<br />
the et€:tion cri(4!s difterentF .(d gre reP)ned o y Ni<br />
.tents wherc emdft wa bUed. rd rci6 that fEld olfi€ eporting<br />
only ral3r a.idenLr Mtrlbutcd . dilpDFrliMt sh@ of laPb.lt4d<br />
hrIAr{q.cr onadI Ifutu N|h@ dft NEI!!5E44<br />
"rrrd b. Frr@ d la b. s ttffE'EFry-(P&<br />
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