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This 0 page Class Notes was uploaded by Alayna Veum on Monday November 2, 2015. The Class Notes belongs to CS 7270 at Georgia Institute of Technology - Main Campus taught by Staff in Fall. Since its upload, it has received 14 views. For similar materials see /class/234166/cs-7270-georgia-institute-of-technology-main-campus in ComputerScienence at Georgia Institute of Technology - Main Campus.
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Date Created: 11/02/15
Lada Adamic Jun Zhang Eytan Bakshy School of Information University of Michigan WWW2008 Knowledge Sharing and Yahoo Answers Everyone Knows Something Mark Ackerman I39llI Outline motivation a at motivation millions of users are using the Web to pose and answer questions SOURCFR RGE Geoglr net V Ertron WlkiAnswers H Developer Forums u A M i m answer Jf lANSWERs o i 39 out NAVER 7 KIM iN ll ElLlOlE39WlVVlEE Knowledge iN Linked m itquot 0 mu m l 0quotquot oozing out knowledge Knowledge search is like oozing out knowledge in human brains to the Internet People Who know something better than others can present their knowhow skills or knowledge NHN CEO Chae Hwiyoung 8 NAVEI Il l iN xmwngmiwiea Knowiedge in oozing out knowledge quotIt is the next generation of search it is a kind of collective brain a searchable database of everything everyone knows It s a culture of generosity The fundamental belief is that everyone knows something quot Eckart Walther Yahoo Research 19 4x ANSWERS St 1 mm Why not gust search the can39t spell what does this Russian phrase mean quotdobroe utro not horosheequot commonsense knowledge What will happen it I leave the racks in my gas oven while using the cleaning cycle support Q How do get rid of my fear of bees A1 Being afraid of bees is a pretty reasonable tear A2 I39m like that too discussion Have conservatives been good for the USA Outline related work study of online communities I NetScan Smith Fisher et al Answer Peoplequot I Social network analysis LiveJournaI blog communities I Motivations in online participation Lakhani amp Hippel raut related mm SW3 E Harper et al CHI 2008 field analysis of QA sites D paying for Google Answers lead to higher answer quality than not Yahoo Answers WWW D but free open QA sites outperform sites with dedicated 39 A experts 1 Agichtein et al CIKM2007 WSDM 2008 Identifying good answers E use textual analysis clicks and community ratings E find that good questions lead to good answers El Gyongyi et al QA Workshop WWW2008 Questioning Yahoo Answers B using HITS to identify good contributors good askers attract the attention of good repliers related r urr own runoff El Yang et al ICWSM 2008 1 users compete to provide best answer for 3 D infer task and user prestige from interactions El Zhang et al WWW2007 CampT2007 ExpertiseRank D analyze Sun s Java Forum 1 use link analysis to identify experts 1 simulate underlying dynamics 1 Zhang et al UIST 2007 I modify forum interface to match expertise Description of Yahoo Answers What is being shared Not everyone is a Java expert but everyone knows something cars amptransportation beauty amp style hair maintenance amp repairs 337 we e itexdi YAHOO ANSWERS 52quot ask I answer Ham mum gtcimmummnmm0mm Hammad mnnon cm I c c Bul Anser rm Ly Aw My in and wk m Firm 3 i m a III M MM w iiLei iv in in mm m mp Wu m 7 mm 11 mm mm 1 V W mm Var in m r 1 Innis Myanmiaarknilmw1 v imam Ami Snw m mm What will happbn ifl leave me racks in y gas even while using me cleanlng y le Mn m my mm m m m may rave a mung an m mi aiimvs mum in m 4 r maxing he rickswiii m m n Km uu my in Li MW 1 n 1 month Feb 2007 8452337 answers 1 178983 questions unique repliers 433402 unique askers 495414 users who are both askers and helpers 211372 category popularity and intensity of response 5 1mm 39 A K ow edge Mm Mm pm my Sharmg and Yahoo Answers meumx sewn Mmun own mum v v 9 mm m Mm M marmme Cm mow511mm 9 50 Mu w r Wm mm m L Descnpuon 01 a Vahoo MM Answers Hm rm mm 7 mm my A c 5 um mm m H I s 7 M m 39 Jmzxw h V Mm 9L IAMai mm 1113mm Pun ic FW 1 um m Aim Em Lme Sm mm a mm symmy 3mm 1 Cu 2mm mm amp Emma Mquot m MM Gel Stunted Cakegories 7 AH Canegnues Pregnancy amp Pavenlmg en Ready m Pammpam u mm I O hEI PIEunach E Pavammu Related links rwms going on m Answers 7 Answers On The Street Forum should I name my child Liam or Nicholas gt 39 lt category alternative science Hmme gt SUEHEE amp Mamemains gt Aiiamaiiva Rzidy in Pammpaie Aternative Gel Smimlz Top Allellmlive Answelel In In Allswelcls kopelllr was i i r ADVERYISEMENY r quotw V Categories w i i AliCaieauiIes View Iiy DaleEl i Nu aiAnswms Science amp Malhemaims 39 How would you go about getting a iob as a demonologist or a paranormal investigator r i er nawmmswnm hrirAekMWMKH gt72rmiv v wmulesajo Aneunxm Pavanmmal Phenomena Para svcnniu omepmiemanvg did you ever learn or me paranormal ignosts ailens v psychic pawers em allegedly being real I in H Wm Mn 7 Asxed W my p m r a answeis r 2 imurs agn Ra39a e j quotnks in u gm 3 mam snung feeling that u had a pasiiife Whai s galng an m Answeys r in w a m i farm 73h m Answevs On The sum is man any tienil c evidence rm he exiaiance mm pmnnymair 7 Forum in w 5m w i Sani wererhums V amp Save w My WED E De yuu hem m Ewarbensuiy 92mph r in gt i w hrin cm W hwwvcie i answers is my 35w Add in Mvvaimui K Res Hum Miami is quotDesiinyquot1mm LucV397 Hawthey ave reiai d m Hun Clustering categories Arethe replies numerous Lengthy Baby Names 0 m 9 8 8 2 gm Po s Marriage 9quot P IT Rewg renting 9 Jokes QJIQS o 9a 9393 S C leg e rg m39lgratjo Horoscopes a rs ncer m mn EPI ZQWWHistorWnleamg quot Y Gro ps39 rogrammlng o 200 300 400 500 500 700 800 p051 ength Are39the samie erSaaskgervand repliers39quot Let em and rA be the number of answers and replies respectively by user i in category A askerreplier overlap in A cosa b ab lallllbll Apply kmeans clustering using I logav thread length l logav post length I askerreplier overlap average thread length Marriage 5 a AWrestling askerreplier overlap El 5 We selected 3 categories which were stably placed in separate clusters programming marriage and wrestling differences in interaction a matter of degree Knowled e Sharing agnd Botany red posted mostly answers blue posted mostly questions size of posts Answers Clustering categories dimes in iw era cii ioim a m oi degree In each category users differed according to how many people they replied to or received replies from 0 programming programming arria e Wrestling cumulative distribution 0 5 m kg rgmm mg The answerers do not reply to one another YXE Y Y Y IYYY YE XXXXXXE ego memor ks marriage 8 imorrpe Gwenng m A hint of generalized reciprocity married or divorced users sometimes offer advice amp support to one another Si 1 Uan aggro mimm wres i m washing gamma Discussion leads to mutual interaction users engage through asking amp replying iiiiiiiiii i xxyik 1 Pets 2 Sparta a Eusmess amp Fmance 4 Cars ampTranspunanun 14 Ans amp Humanmes 15 Sumety amp cmmre 1e Emena1nmentamp M1151 17 Pregnancy amp Parermng 1Eaeau m 12 WBFamHgK RE anunsmps ll 2n Heaun 22 Fund amp DHnK 2a Trave lI 24D1n1n 011 a 25 Luca1 usmesses b New oerltnnLormcuo NNNN vwmltnmxmmvrvr7fr7f7N a people who answer in ianswer in b people who answer in iask in Outline I Charadterizing breadth of users cam amp Lranspomu39on maintenance amp repairs car audio beauty amp style hair Dist ributiOn 0fentrop39ies for us39ers with 39gt 410 answera number of users 0 1000 l l l l l I 0 1 2 3 4 5 entropy 0 a All answers are in the Petsgt Dogs Mm WW OW subcategory ER mmmam nmmnamgmw am a remawe nevan 45w g 4M H A mm hy AH Anltm5lt Rn Anzwp39 w my 5 w Ly a mum amma hawwa N am whom Mammy 7ineem 3mm om Mnsl mew Mm Jbrvm a name may t2 mm mnxhens reanmsk 3mm den 5 pr DugtrAgtkuLYH mevv mmgu w WM 3 mnzn by a any My mm quotmm J nmAsksakansanswsvs Adaswnr esdvec Why my Hy dug m u mg mg m w m uva 4m yen nD Q39 mm kvchvgm Isunawmr wcm agar Rzaahci Wm W m a wwww mm W WWW L mm Haw my dag w mm mm m m 1 mm W W Wm 1 Wm WM anus mgr awmmu mezn 5mm yaw 2m vuk be addzdm a J nougywzaw rmmswgngvmem Medium en ropy user HT 208 wry All 7 warm in slum iwuuljlktltg iiaiuusagiliw WWWrnmmymmmmm 1 WWW wincmwm DJaeWLudykiuw quotmm umw hymnW wmw wwmwm B39 M 513125 and mm 1 g 1r mm W 11quot Astamummmmmu answevsrAweelsfg rFEmked vmwm mimmwimmmmm mam aappwmr m Rumw 1Jlrkelgmsspimmlw AsksdhysmHAubsww insnmm singezemm Ps51llmBMn2 Wth 2 1r nigmswmuu mum in n mm Knewquot warms FeatM um um Warsztaultuddhism iwznmgnmmthsbasics pleas 519581 772 z m 1 WW 559mm AaliDdWru mr cm m chziouzaarDicc mjjhism 1V39ichingSgim4ailv AzkzdhylmanerJm39c New mm Wm mm mm you iaccamnnd an mmm A erelgm GgiinAal V AstzdhytziLikveir znswaa Jwezksagar zwlec llausnliavs pm whnmllwin 1 1 mam Aymwm AhmJVr anwxzu wmwwrwma What happtr mum in inuhic mmm ammonium i2uiizwzmrdWainsgur zwvzd NBA 31 Can any1 mp Muir iiCrmzlrkszLWum r15Hum21ybwzzmzwr zwivzd Travel I Asia Pacific 1 Pets I Pets General 1 Sports I Cricket 18 Society amp Culture I Cultures amp Grou s1 I Religion amp Spirituality 18 Arts amp Humanities l Philosophy1 L1 entropy 099 L2 entropy 109 Medium entropy user HT 233 mumirngm WWW LquulmlquhAmMMN 1 Beauty amp Style a I Makeup 7 a FITCEZT I General 3 I Fashion amp 5 Acoessories 12 I air I Skin amp Body 3 V MW my Family amp Relationships I Singles amp Dating 6 I FrIends1 I Family 1 L1 entropy 050 L2 entropy 183 New may fa High entropy user HT 575 mew DY m Wu quotquot2 entropy 264 entropy 311 AH Answers r aesmnswevs Th L1 uesnun haw many hcks dues u take m get m We mm are mm L2 2 ee b e Aeyee by ebbbbyyyyeb e 23 e 2 weeye aga e beebyyee 5 N quotHE 013 Geurge W BUSH drd m act cheat EI Wm 012 rst PIESMEMWE 2 e W m7 Asked by Mr 17 answers 7 3 Weeks Ban 7 Resa ved Why rs m agmsr We an J b Lew e am e Aeyee by May a e 3 weeye aga e beebyyee aesr way m make yum ruye happy7 b We e new Aeyee by men e a e 3 weeye aga e b vmrng h rs wrung Wm WM mum a b beyebb e sbymbeyye Aeyee by ebeeey y e a e 3 weeye aga e b vmrng Su harvest queshun mm guys b We e new Aeyee by Myeryebbebeee ebb e 3 weeye aga e beebyyee Famr y rssues Humeee 7 b my Aeyee by yyyeebmeeee e 3 e 3 weeye eeb e beebyyee Wm happenw A b beebyeb eey beeybey ebb yyebeeebeeyee e Aeyee by ynasa e a e 3 weeye e WW2 mum ehmmare We 25 bush ruyevsy wuumm rm uumvy muye cmyard 4 m Pawns e Asked by byybmmbbv e 25 answers e 3 Weeks bgb e Resa ved 0k cnrrsuans my mm 1 L m Reman a Sbymubmye Asked by Chad e 5 answers e 3 Weeks m e Resa ved There aye man Ways m canquot y a HW My questmn an yuu Barman Hrynm m rmemybbs Drseases e Asked b ewesmyee a 5 o y beyb e 5 answers e 3 Weeks bub Does bouts meme dmmum Lawmm we Metric percentage of best answers E best answer is selected by asker E otherwise is put up to a vote by the community YAHOO ANSWERS Hay JR More Innk whatynu gn Cangraeummns vau ve gal a host answer and in extra nomlsi Vow answcrto mniaihwrv qwnswr rmW anspmann has been aims mu war mm m Gamma duyourwcmw Mac Ceinbmteaimin arm mun mr came manna r swcrainw morequeswnsi h l segueihz I mm ursnarrgwnmm knmv m makiwsammnc s any m Vahaul Answers Yum Answer No combined entropy is uncorrelated with percentage of best answers Does trams mailer pr cemttain worries m Metric percentage of best answers in category C compute H2 limiting to a single L2 category level 1 categoryies Pearson p pvalue entropy best computers amp internet Wng science amp math 7022 10 7 Eggnw family amp relationships 7013 10 13 A sports 7001 065 Answer Yes focus does matter when answers sought are factual Lse matters in predicting vbestan iswers No matter whether what one seeks is facts advice support or conversation lengthier replies are appreciated 7 o 8 g d o i a In x E m 5 8 i C O i E E i x 7 i 2 5 o a i E m i 1 i c i o 7 i 1 4 4 i i best not best lose matters in predicting bestan swers WEI lellglll thread lengt Programming previous best answers previous answe R Marriage Wrestling 0729 0693 more predictive fa The 092 difference for programming the users39 past track record is Outline Conclusion a at l everyone knows something I user interactions differ by category I some users are more focused than others and it matters in technical matters I simple metrics hold predictive power for best answers ll augmenting interfaces to match expertise I tracing replier strategies over time in question selection I analyzing the role of community in QA forums I39llI
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