[求助] within statistics ?

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Could anybody kindly explain how the "within" statistics are calculated by xtsum ?

Why sometimes it is negative?

(XTSUM is a STATA command for obtaining the discriptive statistics of a panel data.)

Thanks!!!

[此贴子已经被作者于2006-8-31 1:42:05编辑过]

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关键词：Statistics statistic Statist Statis within 求助 Statistics within

Please...

[此贴子已经被作者于2006-8-31 21:40:23编辑过]

它好像是由两个东西相减得到的，所以无法保证为非负数