Apparently, pretty damn hard. http://timothysykes.com/wp-content/themes/timothysykes/img/paulson-comp-letter.pdf
Predict a bottom -in a bear market???; same principle; as a bull market making new highs-fairly easy to call ''a bottom''. THE Bear market bottom,as your data shows,only in hindsight is THE bottom called ; or THE top in a bull market, same way
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