unifrib oktttrs ocnMir - Legacy Tobacco Documents Library

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roc.rui.f.ed by n) .ur.P.e numher of vol.wrteer wor9cers of the
Aiaori .r,an Cr.necar 3oe.iot.y . Vcc),unt.eer wor9eers of the Arnw•i .cr,n
Canc.er Soc.icf.y may con :;i . N t lerhely of relat7 .vc S of cnnuer
vi.ct.i.M r-. or of indd.vfdtte:ls with strong convici .i.ons on cruicer
and ais Fuch cun not be conFi6erod unbfas,od wi .th respeet, to
t.he effe .c.te, oi : :rnnhi .nY~ on c ..noer . 'fhu fa( :t t.hat, a lzreo nuru-
hor of sqe,h tvoxRCr . wa r involved % e $ i n rw wmy eli.mirnclla
1946
po'LC,i)i) .e hJ.NFRFM in4ro/iUCOd bS' this pTrt:icnlar lil4tho(i of selee-
tion, ltccausca of this source of bias the populat.ion studiod
hy l .rn» : :a nd ;_s: L mposr,ib1e to define . .
Anot,her pro4J .e,ra r+ith all prtscnt rctud4eer wau that w5thout
e)CCelnti.(RI the pCr cent of ryRP, blO rCt)1.1efJ to qt1e51.1Onna4reE1
or to f01).Crl9--00s hKVe boon GAtrO[dcl .y t.T4@11., The p(Gr eent
ofur.aFJ.o rmter?zf in fo) .).ow~ups ru•o Civen in the taliln bclow
v:hich hrs boen £atcon frrna Smokinr: r :nd t.on).th (paF[e pf),
9'el0.e 16 .Wbt•nent.alqes of usable ropl,iem in five studiec
lirit4r:h U,S . C :all.forni.a Cal.ifornir. Canad'aan
eloctors vetoruns occupatAontal f.npion voterane,
cih Fi8,F.S 83 56 G7
F:hat eFfect i.he lec) : nf respoue.es has had on the observed
rocnk9e, :it oxtremely hszrd to deYi .noa Certninly , whnt.evor
none)ar:kocre can be baseti on such iucompl .etn surveys are depend-
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ont on ex /tirc':at nueibor of as6unLpt.i.onv, which one has Lo be vri.19 . .
iqt ; t0 tlni .:C .
http://legacy.library.ucsf.edu/tid/hly24f00/pdf
4notlmr mosYt di.&turbinl ; A©ai= s: .bou.t the vnriouss s a w ple