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A Price Tag on Alpha - Part I of III

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 Guy R. Fleury, Independent Computer Software Professional

 Wednesday, October 4, 2017

The other day, someone in a Quantopian forum, probably referring to his stock trading strategy, asked the question: What would people pay for performance of over 25% on a yearly basis? The answer evidently should be a lot as this might put someone at the very top of the 0.1% of portfolio managers. For instance, to give this some perspective, Mr. Buffett has maintained a 20% CAGR over the years. And, look at what he achieved for his shareholders and himself. Maintaining a 25% CAGR (compounded annual growth rate) would be nothing less than most impressive. Of course, this would be on the premise that the trading strategy could last for an extended period of time, and that it could handle large sums. The larger the better. In such a case, the alpha could indeed be quite valuable.


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2 comments on article "A Price Tag on Alpha - Part I of III"

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 jean-michel berthelot, EX Directeur chez Société Générale

 Tuesday, October 10, 2017



On s en fout....on veut la martingale


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 Guy R. Fleury, Independent Computer Software Professional

 Wednesday, October 11, 2017



Bien sûr, moi aussi. Par contre, il faudrait mieux définir le terme martingale. Si la définition en est une mathématique, alors pas de chance. Il y en a pas d'utilisée. Pour une méthode de pari où l'un double suite à une perte, eh bien, là encore, pas de chance. Mes écrits passent complètement à côté de cette pratique.

Si pour vous le terme martingale devient un substitut au mot stratégie. Là encore, pas de chance. Je préconise que chacun développe ses propres stratégies afin qu'il puisse bien les comprendre et en avoir suffisamment confiance pour les implémenter.

Notez que la littérature académique financière, en général, vous propose un alpha de zéro. Dès lors, votre meilleure “martingale” est d'acheter des fonds indexés. Je pense néanmoins qu'il y a des méthodologies pouvant extraire un alpha. Mon site propose plusieurs exemples.

Évidemment, il faut faire ses devoirs qui, pour certains, semblent bien difficiles.

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