SlideShare a Scribd company logo
2009   11 26
               1
7000.00




6000.00




5000.00




4000.00




3000.00




2000.00




1000.00




     0
          1

              2
✤




    ✤




    ✤




✤




    ✤




    ✤


        3
Credibility Degree   0.4




                           4
Wikipedia




            5
Wikipedia




            5
Adler et al. WikiSym ’08, WWW 2007

                          ✤


               Author A


                              ✤


              Author B
                          ✤




               Author C


Lifetime = lifetime
                                                           6
Lifetime

 50
                                        OK
37.5

                                       NG
 25


12.5


  0
       1   2   3   4   5   6   7   8    9    10

                                                  7
60    =1       =167       =7   =1
✤




    ✤        Wikipedia      : 60

        ✤                          950,548   ,   300 GB

    ✤   Wikipedian   : 70

    ✤          :     1                              11,625




                                                                   8
✤                                 (kBytes)
                          3,000


                          2,250
    ✤   80%
                          1,500
              (Ziph   )
                           750
    ✤   20%
        80%                  0
                                             ID


                                                  9
✤




✤



                                                                 10       (x 1000 editors)
✤
                                                                  9


                                                                  8


                                                                  7




            Number of Editors
                                                                  6
✤

Adler                            Uncredible editors
                                                                  5


                                                                  4
                                                                                             Credible editors



                                                                  3


                                                                  2


                                                                  1

                                                                  0

                                -10     -8       -6   -4   -2         0         2        4   6        8        10
                                                                                                          (degrees)
                                                            Reliability Degree




        ?                                                                                                             10
1.

2.

3.

4.




     11
1.

2.

3.

4.




     ?
         12
1.

2.

3.

4.   =       x -log




         ?
                      13
1


                                          0.9


                                          0.8
Spearman's rank correlation coefficient




                                          0.7


                                          0.6


                                          0.5


                                          0.4
                                                                                                         Amount of description
                                          0.3
                                                                                                         Number of articles
                                          0.2
                                                                                                         Amount of desciption
                                          0.1                                                            and Number of articles


                                           0
                                                0   10   20   30       40       50       60         70       80      90       100

                                                                   Reduction ratio of editors (%)




                                                                                                                                    14
✤




    ✤




    ✤




✤




    ✤




    ✤

        15
✤




    ✤                Wikipedia

        ✤   85,028               13.6%)   705,713         (Bot   )

✤




    ✤                                         98    443     )


                                                                     16
1,000,000


                         900,000


                         800,000


                         700,000
Calculation time (ms)




                         600,000


                         500,000


                         400,000
                                                                                          Amount of description

                         300,000
                                                                                          Number of articles
                         200,000
                                                                                     Amount of description and
                         100,000                                                     number of articles


                               0
                                    0   10   20   30    40       50      60          70      80      90        100

                                                   Decreasing ratio of editors (%)




                                                                                                                     17
10


                           9


                           8    40%
                           7                                                        Amount of description
Averaging Increaced Rank




                                                                                    and number of articles
                           6
                                Amount of description
                           5


                           4


                           3


                           2
                                                        Number of articles
                           1


                           0

                                            Important Editor Identification Method

                                                                                                             18
✤



    ✤



✤



    ✤           2%

    ✤



        ✤



            ✤

                     19
✤




    ✤




    ✤




✤




    ✤




    ✤

        20
21

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Wikipedia ws

  • 1. 2009 11 26 1
  • 3. ✤ ✤ ✤ ✤ ✤ 3
  • 7. Adler et al. WikiSym ’08, WWW 2007 ✤ Author A ✤ Author B ✤ Author C Lifetime = lifetime 6
  • 8. Lifetime 50 OK 37.5 NG 25 12.5 0 1 2 3 4 5 6 7 8 9 10 7
  • 9. 60 =1 =167 =7 =1 ✤ ✤ Wikipedia : 60 ✤ 950,548 , 300 GB ✤ Wikipedian : 70 ✤ : 1 11,625 8
  • 10. (kBytes) 3,000 2,250 ✤ 80% 1,500 (Ziph ) 750 ✤ 20% 80% 0 ID 9
  • 11. ✤ ✤ 10 (x 1000 editors) ✤ 9 8 7 Number of Editors 6 ✤ Adler Uncredible editors 5 4 Credible editors 3 2 1 0 -10 -8 -6 -4 -2 0 2 4 6 8 10 (degrees) Reliability Degree ? 10
  • 13. 1. 2. 3. 4. ? 12
  • 14. 1. 2. 3. 4. = x -log ? 13
  • 15. 1 0.9 0.8 Spearman's rank correlation coefficient 0.7 0.6 0.5 0.4 Amount of description 0.3 Number of articles 0.2 Amount of desciption 0.1 and Number of articles 0 0 10 20 30 40 50 60 70 80 90 100 Reduction ratio of editors (%) 14
  • 16. ✤ ✤ ✤ ✤ ✤ 15
  • 17. ✤ Wikipedia ✤ 85,028 13.6%) 705,713 (Bot ) ✤ ✤ 98 443 ) 16
  • 18. 1,000,000 900,000 800,000 700,000 Calculation time (ms) 600,000 500,000 400,000 Amount of description 300,000 Number of articles 200,000 Amount of description and 100,000 number of articles 0 0 10 20 30 40 50 60 70 80 90 100 Decreasing ratio of editors (%) 17
  • 19. 10 9 8 40% 7 Amount of description Averaging Increaced Rank and number of articles 6 Amount of description 5 4 3 2 Number of articles 1 0 Important Editor Identification Method 18
  • 20. ✤ ✤ ✤ 2% ✤ ✤ ✤ 19
  • 21. ✤ ✤ ✤ ✤ ✤ 20
  • 22. 21

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