2.4.1.2 Friendship tsim cov me nyuam kawm ntawv

Soj ntsuam ntawm siv email cav thiab kev cov ntaub ntawv kom to taub txog kev phooj ywg tsim. Qhov no kev tshawb fawb yuav tsum tau soj ntsuam txog cov incompleteness ntawm loj cov ntaub ntawv.

Nyob rau hauv muaj ntau yam teeb meem, kev soj ntsuam ntawm yog tsis muaj hmoo txaus kom muaj txhua yam uas lawv xav tau sau nyob rau hauv ib qho chaw. Ob tug teeb meem yog tsis tiav cov lus qhia txog cov neeg thiab ib tug mismatch ntawm theoretical constructs thiab cov ntaub ntawv. Ob yam no muaj teeb meem raug hais los ntwm Kossinets thiab Watts (2009) raws li ib feem ntawm lawv cov dag zog mus rau to taub yuav ua li cas kev tes hauj lwm evolve.

Roughly hais lus, soj ntsuam xav hais tias kev sib raug zoo network evolution yog tsav los ntawm peb nta: 1) cov qauv ntawm cov uas twb muaj lawm kev sib raug zoo 2) muab qhia kev ua ub no (piv txwv li, dorms, cov chav kawm) thiab 3) demographics. To taub cov interrelationships ntawm cov peb yam tseem ceeb yuav tsum tau longitudinal network cov ntaub ntawv ua ke nrog cov lus qhia txog cov neeg 'demographics thiab kev ua ub no. Nyuam qhuav pib cov kev tshawb fawb muaj ib co ntawm cov yam ntxwv, tab sis tsis muaj leej twg muaj tag nrho peb.

Kossinets thiab Watts pib cov kev tshawb fawb los ntawm kis tus email cav los ntawm ib tug loj tsev kawm ntawv. Txawm li cas los, cov email cav nyob ib leeg twb tsis tag, lawv tsis muaj xws li txhua yam yuav tsum tau to taub txog cov ntau yam tsav tsheb network evolution. Yog li ntawd, Kossinets thiab Watts merged cov email cav, nrog ob tug lwm qhov chaw ntawm cov ntaub ntawv: demographic ntaub ntawv sau los ntawm lub tsev kawm ntawv thiab cov ntaub ntawv hais txog qhia kev ua ub no (piv txwv li, tus tub kawm ntawv qhov chaw nyob thiab ib tug ua tiav daim ntawv teev cov npe kawm ntawv nyob rau hauv chav kawm). Thaum no peb qhov chaw ntawm cov ntaub ntawv, txhua tus uas yog tsis tiav, tau merged ua ke Kossinets thiab Watts muaj lub hwj chim qauv ntaub ntawv no kom to taub network evolution.

Tab sis, muaj ib tug zaum kawg sib tw hais tias lawv yuav tsum tau kov yeej. Kossinets thiab Watts xav mus kawm yuav ua li cas lub social network nyob rau hauv no lub tsev kawm ntawv hloov zuj zuj ces lawv yuav tsum tau ib tug txoj kev uas yuav siv cov email cav mus rau hauv ib qho kev kwv yees uas tau kev cob cog rua rau leej twg uas lub sij hawm. Raws li sib tham nyob rau hauv yav tas los (Section 2.3.2.1), qhov no zoo ntawm operationalization ntawm theoretical constructs yog ib tug loj kev sib tw thaum uas siv cov digital ib co kua nplaum rau kev tshawb fawb. Nyob rau hauv lub kawg, Kossinets thiab Watts txiav txim siab hais tias ob tug neeg raug xam tias yog kev cob cog rua ntawm lub sij hawm \ (t \) yog tias thiab tsuas yog hais tias lawv tau sib pauv emails (\ (i \) tuaj \ (j \) thiab \ (j \) tuaj \ ( kuv \)) nyob rau hauv lub yav dhau los 60 hnub. Cov kev xaiv no kuj tsis arbitrary; lawv tau raws li nyob rau hauv ceev faj saib xyuas ntawm no empirical chaw, thiab Kossinets thiab Watts soj ntsuam hais tias lawv tau twb robust rau cov kev xaiv. Nyob rau hauv kev, yog tias koj operationalization yuav xaiv ib co kev cutoffs-hais 60 hnub es tsis txhob 30 hnub los yog 90 hnub nws yog ib tug zoo lub tswv yim los mus ua kom paub tseeb tias koj tau tsis rhiab rau qhov kev xaiv.

Thaum Kossinets thiab Watts nyob qhov teeb meem tshwm sim los ntawm incompleteness (eg, uas ploj lawm demographic ntaub ntawv, uas ploj lawm cov lus qhia txog qhia kev ua, thiab uas ploj lawm theoretical constructs), lawv tau muaj cov ntaub ntawv uas enabled lawv to taub cov peb lub ntsiab rog uas muaj peev xwm tsav network evolution: 1) lub qauv ntawm uas twb muaj lawm kev sib raug zoo 2) muab qhia kev ua ub no (piv txwv li, dorms, cov chav kawm) thiab 3) demographics. Raws li ua ntej lawm kev tshawb fawb, lawv pom tias cov neeg uas muaj zoo xws li cov demographics yog feem ntau yuav tsim kev sib raug zoo. Txawm li cas los, tsis zoo li ua ntej lawm kev tshawb fawb, lawv pom hais tias qhov no tus qauv xav mitigated los ntawm cov uas twb muaj lawm network qauv thiab qhia kev ua ub no. Nyob rau hauv lwm yam lus, cov qauv uas ua ntej lawm soj ntsuam tau pom tau cov qhia los ntawm cov ntaub ntawv uas ua ntej lawm soj ntsuam tsis muaj. Yog li, los ntawm ntse soj ntsuam txog cov incompleteness ntawm lawv cov ntaub ntawv, Kossinets thiab Watts twb tau hais txog tus sis ntawm ib tug ntau yam sib txawv ntawm cov yam tseem ceeb uas tsav social network evolutions.