Talk:David X. Li

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Untitled

I'm going to guess Mr. Li put this page up himself. Pioneered the use of Gaussian copulae? Oh really? I'm sure the statisticians who discovered these long ago would be surprised -- as would the statisticians at places like Renaissance and Citadel. This page should be deleted.--128.135.149.78 19:17, 14 November 2007 (UTC)[reply]

The article doesn't say that Mr Li pioneered the use of Gaussian Copulae, it says that he pioneered their use for the pricing of CDOs, which he did. The bigger problem with the article is that it basically just plagiarizes the wired article it cites. —Preceding unsigned comment added by 24.125.42.22 (talk) 00:52, 25 February 2009 (UTC)[reply]

The first paragraph about his early life never quotes the wired article it cites explictly, but almost everything is plagarized either by taking the words directly or be using tiny variations. Isn't that against Wikipedia policy? —Preceding unsigned comment added by 18.241.6.133 (talk) 19:51, 26 February 2009 (UTC)[reply]

I finished reading the Wired article and it looks like they copied most of it without citing the source. --68.51.72.144 (talk) 15:02, 2 March 2009 (UTC)[reply]

But the wired article has a link to this page (first sentence, David X Li). —Preceding unsigned comment added by 218.101.92.240 (talk) 11:26, 3 March 2009 (UTC)[reply]

Mr. Li has a Ph.D degree in statistics from the Department of Statistics and Actuarial Science, the University of Waterloo. His PhD study concentrated on Actuarial Science. The distinguished Professor Hary H. Panjer is his Ph.D supervisor. —Preceding unsigned comment added by 64.231.46.149 (talk) 05:35, 15 March 2009 (UTC)[reply]

The real world is never Gaussian

Mr. Li shouldn't be blamed, he set up a simplified model based on Gaussian copula for the CDO-pricing, in order to create a new path for the pricing approach in the academic CDO research. The bankers are wrong to have used such a simplified model into the real CDO world, without considering that the real world is much more complicated than a Gaussian model. Academically speaking, the multivariate modeling used up to now does not properly describe financial and economic time series. The reason is that these models are mainly based on the Gaussian or on elliptical distributions. ——Nutcracker胡桃夹子 ^.^tell me... 19:37, 20 April 2009 (UTC)[reply]

Well, even this casual explanation is way over my head, and probably over the head of the bankers - I think the actuaries needed to do a better job at communicating complex and difficult stuff at an understandable level. I think Li did personally benefit and it seems unlikely he would have undermined his own career when everything was going well, in particular when he could pass the buck and say it wasn't his fault - it was sort of a sin of omission, he didn't raise the warning flag, at least not very loudly. Although this all easy to say in hindsight. Green Cardamom (talk) 12:30, 27 April 2009 (UTC)[reply]

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