Changes

     Care should be taken when cell categories are combined (collapsed together) to fix problems of small expected cell frequencies. Collapsing can destroy evidence of non-independence, so a failure to reject the null hypothesis for the collapsed table does not rule out the possibility of non-independence in the original table.<br />

     Care should be taken when cell categories are combined (collapsed together) to fix problems of small expected cell frequencies. Collapsing can destroy evidence of non-independence, so a failure to reject the null hypothesis for the collapsed table does not rule out the possibility of non-independence in the original table.<br />

   '''As with most statistical tests, the power of the chi-square test increases with a larger number of observations. If there are too few observations, it may be impossible to reject the null hypothesis even if it is false.'''"

   '''As with most statistical tests, the power of the chi-square test increases with a larger number of observations. If there are too few observations, it may be impossible to reject the null hypothesis even if it is false.'''"

</blockquote> <ref>http://www.basic.northwestern.edu/statguidefiles/gf-dist_ass_viol.html</ref>

</blockquote> <ref>http://www.basic.northwestern.edu/statguidefiles/gf-dist_ass_viol.html</ref>--[[User:ElyM|ElyM]] 17:24, 14 March 2009 (EDT)

 

 

== References ==

== References ==

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