CCL: How to calculate the Hammett parameter?

[Jinsong Zhao <zh_jinsong_at_yahoo.com.cn>]

Dear all,
 Is there a method or program to calculate the Hammett
 parameter which is used in organic chemistry to
 describe the electronic properties of molecules.
 I will appreciate any response and suggestions. Thanks
 in advance!
 Regards,
 Jinsong
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