Enron Mail

From:zimin.lu@enron.com
To:zhiyong.wei@enron.com
Subject:correlation matrix reduction
Cc:stinson.gibner@enron.com, tanya.tamarchenko@enron.com
Bcc:stinson.gibner@enron.com, tanya.tamarchenko@enron.com
Date:Thu, 12 Apr 2001 01:38:00 -0700 (PDT)

Zhiyang,

Got your message.

As we discussed, the best way to breakdown the big correlation matrix between
different location indices is through "cluster analysis". The idea is to
select major
hubs and the "satellite" markets. By establish the correlation between the
hubs
and correlation between the satellites and the hubs, the big matrix can be
significantly
reduced. Then the traders only need to input the correlations between the
hubs.

This technique has been applied in our Value at Risk system. You may talk to
Tanya to find out the details.


Zimin




PS: the wsprd code you requested.