supply chain management

272Malhotra,Gosain,andElSawy:LeveragingSEBIstoEnableAdaptiveSupplyChainPartnershipsInformationSystemsResearch18(3),pp.260–279,©2007INFORMS

Table4

DirectpathTestforMediation—Fullvs.NestedModelAnalysisGraphicmodel

R2fullmodel0.245R2nestedmodel0 199f2value0 06Pseudo-F 1 35 2 07

STD→AKC(0.235 ,t=1 188)

STD→MA(0.518 ,t=3 642)0.2870 070 30410 34

Signi cantatp<0 05level.

betweentheuseofSEBIs(STD)andadaptiveknowl-

edgecreation(AKC).Inotherwords,thereisadirect

effectofuseofSEBIsonMA,andthereisalsoan

indirecteffectmediatedthroughcollaborativeinfor-

mationexchange.Ontheotherhand,theeffectofthe

useofSEBIsonAKCisfullymediatedthroughcol-

laborativeinformationexchange(CIE).

Further,wealsoassessedthemediationeffectof

CIEonthetwoDVs(AKCandMA).Todothis,

weusedthepathcoef cientsandstandarderrorsbe-

tweentheuseofSEBIsandtheMV(CIE)andbetween

CIEandtheDVsobtainedfromthePLS(Patnayakuni

etal.2006,HoyleandKenney1999,Subramani2004).

Themagnitudeofmediationistheproductofpath

coef cientsbetweentheIVandMVandbetweenMV

andDVs.Themagnitudeofthetwomediationeffects

is0.103(STD CIE AKC)and0.087(STD CIE

MA).Thez-statistic4forthetwopathsis2.06and1.98

(signi cantatthep<0 05level).

Thez-scoreiscalculatedusinganapproximationforthestandard

errorofthemediatedpath.Theapproximatedstandarderroris

222222computedusingtheformulasqrt p1s2+p2s1+s1s2 ,wherep1isthe

pathcoef cientofthepathfromIVtoMV,p2isthepathcoef -

cientfromMVtotheDV,ands1,s2arethecorrespondingstandard

deviations.44.4.StructuralModelThe nalresultsofthePLSanalysisareshowninFig-ure2.WeevaluatedthestructuralmodelbasedontheR2valuesandstructuralpathsforeachoftheendogenousconstructs.AscanbeseenfromFigure2,themodelexplainsasubstantialamountofvarianceintheDVs:MA(R2=0 28)andAKC(R2=0 24)betweensupplychainpartners.Thesigni canceofthepathswasobtainedthroughthebootstrappingproce-dureinPLS.Theresults(Figure2)providesupportformostofthehypothesizedpathsintheresearchmodelshowninFigure1.ThereissupportforHypothesis1,asthepathsfromCIEtoMA( =0 33,p<0 05)andAKC( =0 32,p<0 05)arestatisticallysigni cant.TheuseofSEBIshasapositiveeffectonCIE( =0 32,p<0 05),providingsupportofHypothesis2.Hypothe-sis3ispartiallysupported,astheuseofSEBIshasasigni cantdirecteffectonMA( =0 53,p<0 05)butdoesnothaveastatisticallysigni cantdirecteffectonAKC( =0 24).Asdiscussedearlier,theMAshowsthattheeffectoftheuseofSEBIsonmutualadapta-tionbetweensupplychainpartnersispartiallymedi-atedandtheeffectonAKCisfullymediatedthroughCIE(i.e.,thereisnodirecteffect).ThepathsfromthecontrolvariablestotheDVswerenotsigni cant.