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Tokyo Ramen-to-Sushi Index

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Is there a long-term trend toward more or fewer ramen restaurants relative to sushi restaurants? Is there a correlation of this index with the state of the Japanese economy?

Plot Image
% Number of Sushi Restaurants in Tokyo (東京都のすし屋の店舗数)
% Number of Ramen Shops in Tokyo (東京都のラーメン屋の店舗数)

t1 = time1439;
d1 = data1439;
t2 = time1440;
d2 = data1440;

tn = unique([t1; t2]);
tn(tn < max(t1(1),t2(1))) = [];
tn(tn > min(t1(end),t2(end))) = [];
d1n = interp1(t1,d1,tn);
d2n = interp1(t2,d2,tn);

plot(tn,d1n./d2n);
title('Tokyo Ramen-to-Sushi Index (ramen/sushi)')
datetick
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