[株にゅ] サーベイその3

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・テキストマイニング~文脈や語感のニュアンスの定量化
http://www.iser.osaka-u.ac.jp/rcbe/4thworkshop/Presentation/textminning.kurita.pdf

やってることは何かって言うと,
会社四季報(多分オンライン版)の各会社に対する説明文を
テキストマイニングして,株価変動を予想してみましょうっていうの.
短いノートだから情報量も少ないけど,
会社四季報の文章でさえ,影響がそれなりにありそうだって言うのは
何となく分かりました.

使ってる分類素性は10個にも満たないキーワードペアらしいです.
多分こんなに少なくて大丈夫なのは,
一般のニュースより更に使われる表現が限定的で,
言葉自体も数少ないからなんだろうなって思う.
この数で分類が可能だとすると,
ニュースに出て来てる多数の語を,この8語に落とし込む
って言うのも一つのアプローチとしてありなのかも.
キーワードペアは以下のとおり.
・増益(減益)
・大幅増益(大幅減益)
・増収増益(減収減益)
・強含み(弱含み)
・増額(減額)
・上方修正(下方修正)
・回復(低迷)
・改善(悪化)

この例でも悪いキーワードの方が影響力が強そうだ,
って出ています.
うーん,日本人は悪いことに敏感に反応して売るんだろうか.
リスクを回避しようとするけどうまい話にはなかなか乗らない,
と言う手がたい人間が多いってことか.

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