Re: questions about chi square and g test

On Tue, 15 Apr 2008 11:28:19 -0700 (PDT), ouyang.jie@[EMAIL PROTECTED]
 wrote:

> Hi,
> I am new to statistics. I got couple questions about chi square and g
> independence test. For chi square test, how do I handle all zero
> columns in cross tables? Should those columns be included in the
> table? all zero columns will give zero expectation for cells in those
> columns and cause divided by zero errors.. For g test, what to do if
> some cells have zero observations? That will cause log of zero error.


For the ordinary contingency table, you drop 
any rows or columns that total zero.

-- 
Rich Ulrich 

http://www.pitt.edu/~wpilib/index.html