11:55 pm - 04/28/2012
NINKI ratings for the week of 23/4~29/4/2012
01 28.20 Nakagawa Shoko - Shokotan☆Best――（°∀°）――!!
02 21.10 andymori - Hikari
03 18.00 Oshio Kotaro - 10th Anniversary BEST
04 15.40 JOKER - JOKER
05 14.50 TOWA TEI - MACH2012
06 13.00 Dirty Old Men - Doors
01 150.80 Nogizaka46 - Oide Shampoo
02 71.60 Sashihara Rino - Soredemo Sukidayo
03 43.70 SID - Nokoriga
04 32.20 S/mileage - Dot Bikini
05 25.40 Saito Kazuyoshi - Gekkou
06 23.90 YUKI - playball / Sakamichi no Melody
07 23.20 Matsuda Seiko - Namida no Shizuku
08 20.70 chatmonchy - Hatena / Yume Mitai da
09 19.80 Miura Daichi - Two Hearts
10 19.20 Haruna Runa - Sora wa Takaku Kaze wa Utau
The NINKI ratings are the results of a POLL conducted by Oricon indicating degree of interest/degree of purchase intention in an upcoming release. Although the ratings are never a true reflection of sales, it does give a strong prediction about where the single/album will place in terms of popularity amongst the Japanese public. However, they are NOT an indication of how it will perform in terms of chart positioning and total sales for the week.
According to Oricon's note under the NINKI page, Oricon researches about 870,000 of its members by random sampling of 400 members in their 10s until 40s. 50 men and 50 women are chosen randomly to participate in each age group. (However, some popular artists have had NINKI exceeding 500, so we can only assume that Oricon has extended the polling to around 600/700 people now.)
Oh no albums chart next week! :(
And well it's NGZK46 vs Sasshi week.
Source 1, 2