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500名超の参加者に対する発表でなされた
とあるデータ改竄の例例	
 ?
元データから検証してみました。	
 ?
安藤?一憲	
 ?
Vade-‐??Retro社から安藤が得た元データ	
 ?
発表者も同じデータを得ていた蓋然性が?高い。	
 ?
?日付	
 ? ISP名	
 ? 合計は常に100%	
 ?
?日付ごとにその1?日のISP15社からのスパム送信量量の?比率率率を?示している。	
 ?
Vade-‐??Retro社から安藤が得た元データ(Excelファイル)に付属していたグラフ	
 ?
15社分あります	
 ?
15社の割合の和を表?示するようグラフ種別を変更更(常に?日別合計は100%になる)	
 ?
15社中最もスパム発信?比率率率の多いISPのデータだけを削除(改竄)してみました。	
 ?
ここまでは安藤が?手元のデータで作成したグラフです。	
 ?
(グラフの?高さは?日別割合の合計100%からあるISPの?比率率率を引いた数値です)	
 ?
14社しかない	
 ?
実際に発表で使われたグラフ。前のページのグラフと良良く?比較してみましょう。	
 ?
この画像の著作権は撮影者である安藤にあります。著作権法32条に基づきデータ改竄の事実を?示すために画像中のグラフを引?用してます。	
 ?
問題点	
 ?
元データの?示す意味と発表のスライドタイトルの?大きな乖離離	
 ?
	
 ?	
 ?	
 ?-‐??	
 ?そもそも元データから「スパム発信量量の増減」を読み取ることはできない	
 ?
	
 ?	
 ?	
 ?	
 ?	
 ?	
 ?-‐??	
 ?そのような情報は元データに含まれていない	
 ?
	
 ?	
 ?	
 ?-‐??	
 ?スライドタイトルは「?日本のISPからどれくらいスパムが送信されているか?」	
 ?
	
 ?	
 ?	
 ?	
 ?	
 ?	
 ?-‐??	
 ?グラフの意味そのものをねじ曲げて発表している	
 ?
元データから恣意的に削除されたあるISPのデータの存在	
 ?
	
 ?	
 ?	
 ?-‐??	
 ?特定のISPのデータだけ削除するという改竄の恣意性	
 ?
	
 ?	
 ?	
 ?-‐??	
 ?加算しても100%にならなくなったグラフを提?示している	
 ?
こんなデタラメな内容が500名超の聴衆に対して発表され、	
 ?
データ改竄が指摘されているのに発表者及びイベント主催者	
 ?
からいかなる訂正も謝罪もなされていないってどういうこと?	
 ?
※検証で使?用した元データは発表者の表?示した会社から安藤が直接頂いたもので	
 ?
	
 ?	
 ?	
 ?発表者及びイベント主催者の意思とは無関係に使?用することができます。	
 ?
※発表時の画像は安藤がデータの改竄に気付いて証拠として?自分で撮影したものです。	
 ?
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