[R-sig-finance] heavy_tailed plot

[WeiWei Shi]

Dear helpers:
I am recently doing some research on enquity returns and I have 2
heavy-tailed distribution and the qqnorm is attached. My aim is to
cluster the data into 3 clusters: lower-part tail, body and
higher-part tail. I am wondering what is good approach or reference to
this question. I believe there must be a lot of research already in
this field but I just don't know how to find them by googling, for
example.

I posted the question to r-help already but I did not get a
satisfactory answer yet.

Thanks,

-- 
Weiwei Shi, Ph.D

"Did you always know?"
"No, I did not. But I believed..."
---Matrix III
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