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So that means that out of 400 people, ~229 showed interest in buying it?
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No.
I don't know what they use, but they tend to say "400 people were polled" but sometimes numbers can climb into the high 500s if it's Arashi or something. I really don't know HOW / WHY
that hapens, but I guess it'd be better to say that these NINKI numbers are a sort of index that comes from some other figure. Like if there's a high percentage of old people, their "yay I will buy it" counts as more... or something, haha.
The way they do it (I think) is that they have 80 people in each age group (teens, 20s, 30s, 40s, 50s,) and there are 40 males and 40 females in each group. If Ayu isn't such a big hit with most of the people, you can't really expect her to get a high ranking. It just depends on who is polled and what their preferences are, I suppose, unless it's an artist that EVERYONE loves like Arashi or Mr. Children...
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Originally Posted by SunshineSlayer
I seem to remember the same thing as aloopy - that a couple of years ago the number was raised. I can't remember where I read that from, but it would certainly make sense.
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http://www.oricon.co.jp/news/ranking/7031/
At the bottom, there's something that reads:
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※NINKI度調査は、オリコン・モニターリサーチ会員（約4万人）からランダムサンプリングした400人 の回答者による「興味・関心度」「購入意向度」等のアンケート結果を指数化したもの。回答者は10代から5 0代の各世代男女各50人ずつ。
アンケート調査期間12月9日～12月12日。
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And this is in (miss)understood's era. Cheers.