Instruct: Classify Amazon reviews into positive or negative sentiment
Query: theory is unsupported

Sounds interesting. Honestly I haven't read his book but have avidly read other titles that try to predict future trends. Unfortunately, according to Sornette's own site, the data doesn't support his theory. A lot of complex math and a negative conclusion. Sornette received a lot of media attention when he made the prediction that the S&P; 500 would crash. The media hasn't been following up now that the data doesn't support his theories.The man's own words:"More than two years have passed and our projections for the US market have not been verified (we have also offered the vantage of foreigners and have extended the analysis to other foreign markets with better success).The origin of our failure to forecast the rebound of the market in 2003 can be traced back, in our opinion, to the following simple point: the mechanism underlying our projection is UNIQUELY based on the imitation and herding behavior of investors."