Hi R-helpers, Is there any packages can do "*zeta-squared transformation*"? The Zeta-squared transformation comes from the following article: Standardizing Variables in Multiplicative Choice Models Lee G. Cooper and Masao Nakanishi Journal of Consumer Research, Vol. 10, No. 1 (Jun., 1983), pp. 96-108 Thanks for any help in advance. miles -- －－－－－－－－－－－－－－－－－－ Miles Yang Mobile：+61-411-985-538 E-mail：miles2yang@gmail.com Web: Miles Yang Website <https://sites.google.com/site/miles2yang/> －－－－－－－－－－－－－－－－－－ [[alternative HTML version deleted]]