The control chart on page 4, gives a clear signal that the data has a problem with precision. There are only four or five  plateaus  in the data. This would occur for example, if you were measuring thickness with a ruler calibrated in units of 1/16ths and there was little chance for variation in the data

Holmes, Donald

Mergen, A. Erhan

English

RIT Scholar Works

Data precision - Do you have enough?

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Rochester Institute of TechnologyRIT Scholar WorksArticles2000Data precision - Do you have enough?Donald HolmesA. Erhan MergenFollow this and additional works at: http://scholarworks.rit.edu/articleThis Article is brought to you for free and open access by RIT Scholar Works. It has been accepted for inclusion in Articles by an authorizedadministrator of RIT Scholar Works. For more information, please contact ritscholarworks@rit.edu.Recommended CitationHolmes, Donald and Mergen, A. Erhan, "Data precision - Do you have enough?" (2000). QC Report,Accessed fromhttp://scholarworks.rit.edu/article/496• ]I,}lIn ThjfbWC'Wh.... "'''' •limpl")"Of "'uf,l •COIll,<>l Ch>n' "',,,deProo"" lie',"...Ii,.... Calendar,~on:r<aIl)l," ,doff iMue. """'fp<aOI...lAd 00Mr0I, The ,nJepe1d<n'of...,;hod><r H,'""<' lf~ P"""'"'' ',...c ..............c <;<'....all do hop< U l> ~\ -,n, 'p""" 000', be <OIIf,,;cd'We .... ~lIddropp<"III><"'""..mod<-f...r .ina II ,mpl"", .......m.ng o!Ilt "".C<pUtI~ .....y be 'Olng on he,e IDune .....,·_.pun:;c~, :-'lonljornery u'" "mod'lied")E.'oty""esccms ,n al!'<C lh.. dLllt> ".(('~ RQlor .Onlhin.ti"n RQl·AQL '0 •.,.ph,h n,l< Ie,,·e1••bouldcarry ,he ,"'",--d """<cp'".Ct:!" IS. partoflll<i'lill< plolKrOl'i.,~modl.icJ" It.J""add. to Iho <OIIf">I"'1.,~{Ol; ~5t;orrr liBtAn: ~ 5,C",,[win, ["<lor nThe o:lIISUUC1'OII ofaco:pt.l'lC<: cham rcqui~ lhatyou decide ....ha, In''' risk you ....ould like to COlI_>id<' (I\.QL. RQl., or a oombInallOll orAQl &lidRQL) ...ben WUlJI' "p lb< J....,.., If)"" dec>d< 10.... "" AQl. typ.¢ of not 5Otll"l, II>< ohan ....II ~referred '" by _ folks "', "modified concrol<1Ianw Uld by O!ben '" .I"" ...·~e OOQ-t:oI chan" • but dorl-l f",~ lOdrop lhe word ~con­ttvlw ....hen you IlI'I: .~pl.awn, <his", _ el....•• • h;ll'l wh«h ~1I"wl you to de,eet,u.inj XbM< fOf e.."'plc. when !hePl'llCeu will be prod"",nj "" un_lICCep!lohle l.vel of DOIlCOftfonrung-=C_fiui-l/«tN"Tho< o)-PC olelMn!baWd be aJIed III~chan'" _ .... III wlCCqUl'CC CQIIItOle'-tw _ <iu<:c"deals o,lly "'lIllhe deci>;,oa IS to ...he\her or ....the prnces.llhould be acc~ or r<JlfC'<d_ So,,"'hen you ore relldi"l! a/o<>u' these ctwts ia the:t.... m.ntioned, j,,", ignore the ...OrJ "e,,""ol",I, ..,II appo_" you reid ltus h...- Ilw\here .., !Ine differc",c~ be'ng 11"...._altd forlh.... l=bOfI. llIa! os lIICOfTCC!. 11><",...... ,ype:Should You Usc: .-\cceplance Of Modified CaPIro! Chaw?What's New?S.()<'ho• ...,~li:r.e. tba< ,1",..-1100'SPC p"""'''''' 10"'" unl'l"" prob-Ie"""",, ..e\... deolpcd. n.....,mo..., '" dop.h, US« co"fip~eda.aen"Y~.-1 C3H Studyfor the P./H'T Industry'Ao part of Ito alIop-lloor d..;g».~PCDI_. pJ'O"id.. J'ft<""fit""«lItldu'lJ)'-.p«llic (on". (or e..y n,,~""P, poperle.. do... e01l«l1oo.TI", Iw'&~ '" th., rl&~, I..... "'-1" •...,100 of. dora <11""'..:r-o,..<""".Iy 'oarigu<e<t for. po~mill.SPC~ u OIl --u-. rnl-u-,_."",' w< outiaoi<ol JI'1l'<C'I"---'·orioc ~..0100-.. no.- .p, OCC<I".........J _ dirt<, Pl< "'I"'.....-"u...."o.....i<.>lIy poU lorJff 1"""'''',"",,,,I do .. _uuit!<>n .yo« .....PI,,,••~JIS,ccl", '" 1-l/()()..<~6-H)J4,lOT n><>l'< h:I'<>nIU dOD.11><n: are .Onle p!'OC.IJeI whioh. due '0 111<""~,un:. are .'p""10<1 10 h>v. "n~,'oid.hle ,hlf'l;n ,he" IV'''lIge valut. bu1 "hleh are .~II abl.'" ""Ify eUSlomc:r ..labl,Wd 'P«' flC:lIUOtIlnu, il'_ occ.......hen lhe Itandard de-,~ 0( dx~. al lhe ,-.iow; ,venose,.,.1...., ol!llc proeeu. .. ""y small rdou". 10"'" lOlef...,. -.dill. !II....w SI."'..... pro-...... eoaIrOl ......... """'" a jlIQ<C$!i os lOOt , ....wnlJUl bus ""'y be abIc 10 prod1£<: ... ~.P'I­>bk prod",,!. CIwu lIw on: u.. ful for Ill"')'p.¢ of.l1\Wi"" are descnbed ,n bolh Du",,,,,(1) ."d Mon,g"",e!')' (2), You w;ll aeW '0loo~ for ''lI<:ceplanee C<>/Itrol dorts" 0' "modi·f..d .""!lol charts" ,n those leXl., W. ""lJ....,.... you ho.... '0 build one ,. the next QCRepan. BUI fIlS! we need (Q ...... you 1Iw.tllere II IICCdk.. COIIf"""" >bau' ... ha1 tiledwt$ <hould be C2l1ed.D3t3 Discussion•••"",,'d'0" [I,a[ you 'n' '"'"' yoo It"'e ~"()(><l ~',;' go,ng'"'~ ,110 d,,,!»«. thc ""Xl i«ue j, pUlling 'hatdo" to "'o,k fo, process ,mp[Ov'.me01SUpl""<'. fl>f e»mplc.'hat y<>U ""uld Ilko [<I,mp",'e ,he daJl.') ,du 01 )'00' f"occ", Y,,"--O\j",'" the d,l,b,,,, ,,, SC! ,Ile da,ly }',dd I,,,\he j;<t ,hree 11>""ti" TI", d• ., can lhe" be1"<:;,"Hed a;, h"IO~f"ll\ ;,ntlf(>f' "<:nd ch,rt[0 help "sse" the ,i'u:"i,", Ha' Jn~WI1lI'Ul<:'we ..."r,,,,,,,, ilk.<: Cu>!oovQC, "",11 mole Thai[d'. "tite, "",pic 1<> perf",m lin.). ""jngthe Sl'l:' ",ft"',re ,·mkdJ."Il ,,' 'he J.",Il",e.a' " j, It, the Q~l[)'. m,,~," 'Ile ",h"k t",~nen "mphSUI'I'",o, next, you w,>Uld like to dcl'T1",ne[Ile f"'>(C'> 'del"" Iha' ",em 10 1>.' dnviog Ih."dd to r1< ","Oll< 1.,<:1" H<:re as"i". !iI'('""I)',e,. I, •• IllLllttplc rcg,o"Hln <lr k,'y'a,i.ble ,Uc""I«'a"Oll call hclp ",[h til.,mp",,·e l11<:n'la'........................· .Important Ne"~for StochQS CustomersUr 1....,1,' II,~",," .,,11 ".., ,""l"he m,,,,ol ..1"" on P"I"'" -" -' ",,,~n.llha, UTe' JaLd ITa, a P'"'' [I'",'1"""''''''' no,' ,,,,II t"ur ,',j lpl.",'.,,,, ,n ,I,,· :.,'.' I'" ",,I.:Im"".lml'k ,II,'"",'"·,,,,', , ,h[I"" "TlIl:l roll,'! .a',hra'e,~ 'n 'IC ,. ,IIII ~ [IT, ar'" [11,'''' ".' I'H,," , I"" ,_,' t,·,,,,,won.,, [he J.'t., fhe I.".,' r "mc',urcd "ndiU< rc"",kJ I.. " , ,", , ,llull,l", 01 dig'" '" he 11 ..11',,,1 ,'r 4L,mpm'e,ner,',II,." II" .1",,,,, I", ",'"""al1nll'M' dat.", "h I. 'u' ,I,,,,' ",1>• (h," '"" u,,,al Lw" .1.",.".. , rI,." ,~, 'Ir. l'• chdf!''l1,e "al1d,,,d ",k tlut """ "neo h,'"rth:'L 'hc 'i'"'c ~L~,','n ,I,e "II" '" "a ~a~e ,1"",ld 1>..' ,'".dl ,.[ 'L,,,,,.Ll,..lI,,,, I,,"'" ~dll, " I,m:H~' "p,,~ \\e '"'i''''' tI,.. L[IT ! II!>Ia ",,,.1,," f\' ".1' ,,' 'II -'''' t ,Il.'Dala P,-ecision -1)0 )'OU have enough'.'WWW.stod ...S.COIlI511,eh05 Cu<lOlllelO",mno'" ,i,il Ollr W"b T'31:" rorsupport infWlllaliOl'.SUPPORT ON TilE WEll••, ,,,h~ "n~cr""ndin~ or tho ba,ie plTil""".pITy <Jf SI'C ' of 'IT<: e""",,,1 n,'ure of "",.<:eSS \ ",,""On,S[oclTO/i h., I"<lviued b.", >rod "d"ltoedSPC If"jn,"~ to Ic"di"~ I.'S 3n~ IOrrign<:ornpam<:, for ,t, ""(lie ,0 yoO'., ~(".'''I­enee. ThlS trai",ng ,n pm",,' ,oc",ureroc,"'ooh"'4""" J.u ""B'"g a"d ,,,,1,';" 1"0-"dc, 3 V'Cr) '1I'''''~ IT,,,,, (Of pr,,,:,,,, ""pf~v"n"'nt"YOll can't elpeeltn ha\'~'luallt}" Improvementwitbout a measurement andoRDlys;! system,",•(J"T.. R,-", ,(J"'! 17· I., 11"~'(no,,", ,p, "",',ho"\'"".",,", " '" OJ'IIdd "Th.' U""', "" ok- ul 'd''''. I,,~ "" 10"".l;uh..2~-'" ", """",..."" Im"n.. ,,"'"' ',·m",.'I,',·,,,.. ,'! ", I",n"',,,..... "·/ ,', ".F,","'~''''",,'''''''' 'm ,'," "."""",,h .',,"' • JlJ. '1c'" " ., ""', "" ,,,",S,,,,,h<ov orr", ....,; ..' "",..,,, '",,'M""'''' ".,...<:....,l.' >::"",,~ ~'«" '''' ,l>"""PI"",,, (1 L!)Jnj.,~ '" .:.,.;" K,""'''''~''"'''"'''''"'S',,"'''''' A""..., """,,.,.,.. ,."','" ,'''''''''''''0" ,",""<" ",,_1m, "em"" "'"' "",...."" '",p",,,m,n' ,.',,,i,,, o,...,;p."'" T''''''IT< ", 'b' ,',' 'f'""> l>< ><c""'f"'''''" " ".'P'IOl '"_,,"" ,...,,,,,, n d", ,,,II, .....' I~'';,,~ I .... ',I... , ,"""''''"" ""wt_""" ....,,'..'., "f""",,"''''OO "".1"" 1'I<' •,'" <rpi"""" '" 1<"'" 0(. ""I ol>or """1'1< The "",, ... , 1I ,h<, ...,,,~ co... ".L~",mp''''''u of 00< "". ') «<mJ"u"I'!'"IlOI'!"S 1:>"" '000C,,"".... C""...",-' C"."IJ<". 1;: -I. 1"J'i'!_~(!o...., ~,~ '" 1mp""", I",p"",·_., -,."":",,Ac~.. ,,", .'1<>.1<1 F,,"'c "",w.1Jp<"""",,,,. m"'....' 0"_1,,,,,f """ .....""",,'"II,,.,,,, "m 0<""" "'''" ~"I'''''K",... ,,~ "'I00 '1ll_S"'o",R"'211,73',72' "",FCTURE EVE'\"TSWh." m,,", Ih~ S,,,,,h,,, 'ystCrTl Uno~LIC ,,~,a'th~ QMDS put> t!l~ d.,•. the n""""aJ)' ."aly",t,x>!< ond process ,nfnono,""" ,Ilt~ lile h.od>." both ,n"",,~emcot "n<l <hop•.-I",,, ,)!'''',,,'''It i, ,m"","iv~ ,h~[ "",mng In [he "'"'01 'he()\ IDS "nd \oc prol"" .naly", I".>..'edu,es be.,·c""'pl"hod O<~''''..,. ,1,0 e"lk«,.,., ord,t" " on exccei", In f""ilty. If you ,100" u,e"Uhe do"). you nu~I"", ''''11 ,,'" CC\llc<! It[}, IV Fdw"d.< Delnln~ ,",iSlCU [hat [IleJis,covcry of. ,,,,,, .. I 'CO"" of v',ri.tion 'lid,[, "''''0\'01 ,h"uld be [he r"'p<>o,ibil"y or,''''''''''''' <"rlnoc,.~1UirlOClly '" i,h 'h<: "per.,j"",Ila[ )'iclu, ua'. (or \he <:",,,wl <:I'art, 1'1.., al<oI"'''''' """It<: Ilece,,,ty (... both "\aHd~"",,,.nlaod ,h"l',n<~.. """"",n<:1 In I,":;';'======~=========================='iii'¥,,§'¥=~(!( 11'1"'" r,c",l'ro!"" u""' "f S1'(: " on e (J I Ihe "1<\>1 ,III pon ,'"'tcp, '0 " ~.....-J pfocc,.Jqual i') iml"'" erocn[pr<>g",m "y"" c,n', e'I"'" ", Ila'" qu,IIt)·,mpmvomon' ""h,,", , mea,UTCme," .lId"",I)", $)"CJII". 'a,J inn ro"ie,. CQE,\boy O',mP'I11<:, out LI..'re [!l., arc "1<l1l1~~PC" ",rmC>! ,doll'" y a") ,"IU," "" II",,, SI'C""''''''''''0' bc""<c 'hev arc <impl), Jr"win~c,,"lrol <:h:"IS, Tho) are nnl hun'lng fo,'"'"~lIab'''cau,,,,' ar<J [ll.,j""g "npr,,,c",,,o,,.\'""'gc"",o' "xt ,h0l',n,~,,-""""""d "mJ", undor<,olld ;lnd ""I"e !he [001, 01 SI'C,"Data Predsion•.."",,'.len fingers, If we had 13 finge". '"c rule...""Id proba!>I)' b< " ka'i 13 'ick Ol"X.,So, ,n any evem, we ,ct 001 ", see if'htre"':l< SOme SQr1 of "",,,,,,1 ba'is for m,king'hi' dec",,,,,,.Our d.d'lOn", base<! On an ",fo[[na,i"nlheory "gumem, (Voo m,y ref.r '0 oorQ.,llly EngHleerinll (QE 4( 1). 1,7 (1991,19'92)) al1i"1o for. mQrc dClaikJ discus-..on ofthlS malleL) We pl"UM the changein infl)fJl1alion ,"O,bble ve".s lhe numberofliek marX. avail.ble, From ,h. plO~ "'eselecred the po"'l.t" hich lhe ,"crease ininforma,io. ,,'a;l.blt as a resul' of u,ingmore tick morks =med 10 be insigOlficanl.The result of thi' "nal YSls was IhJlIhedi'l,nee be,w••n lhe '''k marks should bea, aboo, 0,3 Ume' II'" ".n,laro <Ic"ia,;on ofIhc dot. Ollc". Thi, ,,'ould me.n lh.t ifyou h.d a Nonnal eu ...'e (approxim."ly 'ix<"HldaI<! devi.tion' "ide) tha, fi' cx.ellyinside lhe specificallon lim,ts, lhen lher.~OOu!d be a!;>ou' IS ,;<k ,",rx. within ,heSPC Software DrawingStocb"" is interesled in Whal)'(lU /l.vt t~y. Send us yourop,ni911 On any of theIhrec topics OOlow and we will emer )'ouin Ihe drawing for aFREE; IIl1.>le Version of CU5lomlQCStoclWs' off·Iine SlatiSlioal p.10k;!ge$49~ v,lue,pecifio,liOll!;mlts. This;, a lorg. differ·enoe from the rule of 10,E"mple' The dOl' ~hown on ,he folio"',ing Con'rQl Chan r"p',,"'nlllho widlhdimen'ion of a roll formed PJfl. 11><:,pe<ifi031ionl were si'en as 3~+1·3. Th.averos. "nd 'tandard devi.. ioJl for lhed"la ",t of poilU' w:,e 33,2 and 0.6re,peclively This infofJ1l:uion 'ndic""'th~"ho pm<.-o» i. JlOll'fO[><r1y COll1crodbu'doe> ha"o the ,bjl"y 10 meet 'peeswere iliO be oente"'d, Noti<e, howe,'or,the difficul'y in tr)""8 '0 as",,, 'rend, 0.-unu,",1 eVents e'rly enoogh 10 be helpful,SHOP·FLOOR })QWERlStochos annQunces the release ofSI'C Direct for WiudowsT'lintegrated wilhSQL Server'" 7.0 database.11lc rule we h,,'o dO"dored would ,uggo,"'hal the d,l" should 1><: "",,,,,,,u 'cd='o"kd 10 'h" n"4"''' ~•• rtOf IO.'·U,6"approw""ely 0,25) of" U",; Or pefh,p>, Ifpo,slbk, IOc ,;d marl, ,11""ld b" in 0,2 "r"unll,NOIe [ha, th" a,'.ruge 'nd "a"d"u den'l,o"ofth. dala reco'ded '0 the ..ar.,t ,m'ger arererordtd to 'lit fi", dcc"".1 [>OInl, Th" ""WOpnale ,inc< 'he pn:OI""" "r ..'er;~'(:,'nd ","dord d"',.,,,Oil'.S gre''''' <I,,,n 'hepfe"i""" of lhe individu..1"","urenlt""1Oi' ""'o",,,nl IS ba,,,,1 '''' 'he (~ll"""'SfnelS .bout "mpling d1<lnhu''''n,'The d.., .,ed to m"~c Ihe chart 1.< f'"corded to th, neare<l whole in'oC"r, Thomin;m.m v,lue is 32, The maximunlv,lue i' 35, Tht wleranct widlh fOf rhoproduel i. (g;",n 1~+1-3 .. ,pee.) 6,Thu" 'he rule of lell tiok marks in,jue lh"specs would in'h'ate Ih~' the dala ,oouldbe mO.lured and fCeonkd '0 the ncorcslh.lf Un;1 (6J 10 " applOxir"atdy 0,5)r..lher titan !ho no"",S' whole .n;l.I, What do you fi"d U Ihe mosl dif/i,u[110 u"duSlo"d 'egardi"g SI'C?'2, Share a .ueceu~lory lor SPCimplrmmlaJ"m mili:ill); Sl<><:ho.~olt>.'ar~ willlill jaur camp",,>,J, What uille 1fI0~1 imporlam!aCIOrill a qualify 111Ipro\'emelll pl411?StJ»>riJJi~ ""'J hi: ehAs,"I,,, pztr.",'$in""'" £I«/I()s QC Rq>o(/>..Sub",k,IOlI t>eodlil,e: 1)...",11« 2ndDralO'i>lg"W 11< beJd: O«<",l>tr I$lhSI<>dul< I,,,,,)4 N. CoII:g. Sir..,SClI:"""lCdf', NY !2~(l5r""" (51~)~n.4789 OiEJU>l1 '~!nIOOI'l@-SI\'do.»,<om• •• 11", ,w"u"d de,'i'''"n d ,.mple~'.• ",g.. " rhe ,,,od,rd de,.""",, of 'hei,.... ividual daw I"'''''' d"'i<lcd h)' 'he ","uar"root of the S"e of Ihe >om1'l' u...,d 10caloul,l< Ihe ,ver'g<.•"d• Th" <",Huard de>',allofl of ,Il< ,"ml~"stand.rd d"'i.,,on, is awo" m,tely lhe,I,oo,rd de,'i.,;oo of 'he indi\ ,dLla! J.,t,po;"'-' divided by Iho 'qH"r~ ,,,a oflw;<~'he si,." of the 'amplc used '" o.loul,,,, Ih"<lar,d"d """'""0"Thus. for. '"'<OI,,,ble ""nplc 'lie, Ii'","'erage and .landord d~,'i'lion should t>e",cofde<)10 ot le"'1 On, mO", dig;llha" the()Eigi"al dal,. Forconlrol chart' """~ sm.1I""rnple, (4 '-"~) i' i~ Sl.nd,rd pracll'" tofoll~w ,he f'I'OCedure "f <>n" addi"",,.1 d;gllof preo"'oo

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Data precision - Do you have enough?

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