Dear all, I have been lost in the details of gint(). Though the document says it's "same as ave but do not divided by the total area", I need a formula or examples to help me understand it. Thanks! Ming 2008-04-25 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://gradsusr.org/pipermail/gradsusr/attachments/20080425/75477294/attachment.html