41 citations · 93 across the 11 of their papers we have counts for
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physics.soc-ph2012★ 4 cited
On the distribution of time-to-proof of mathematical conjectures
Ryohei Hisano, Didier Sornette
What is the productivity of Science? Can we measure an evolution of the production of mathematicians over history? Can we predict the waiting time till the proof of a challenging c…
physics.soc-ph2011★ 10 cited
Predicted and Verified Deviations from Zipf's law in Ecology of Competing Products
Ryohei Hisano, Didier Sornette, Takayuki Mizuno
Zipf's power-law distribution is a generic empirical statistical regularity found in many complex systems. However, rather than universality with a single power-law exponent (equal…
physics.soc-ph2010★ 17 cited
Sales Distribution of Consumer Electronics
Ryohei Hisano, Takayuki Mizuno
Using the uniform most powerful unbiased test, we observed the sales distribution of consumer electronics in Japan on a daily basis and report that it follows both a lognormal dist…