66167_en-US

liliconcom

Categorical Correlation

Hi,

 

I like to do two categorical variables correlations. I know I have to do the Chi-Square analysis. The questions I have is how many data points I need to do this? Are there any minimum requirements? 

 

Thanks

Re: Categorical Correlation

Thanks. That's very helpful.

Re: Categorical Correlation

The general rule for the hypothesis test of association with Chi-square is nor more than 20% of the cells have an expected count under 5. JMP will warn you if this condition is discovered.

Re: Categorical Correlation

That would be fine

Re: Categorical CorrelationThanks Jim. I have a two level categorical variables and I guess you are sugggesting to have at least 20 data points for each level.Re: Categorical Correlation

The p Value you receive from a Chi Square, will be adjusted for the number of observations.  Therefore, it will self adjust for your analysis.  However, where Chi Square does fall down, is when you get too many cells where the "Expected" cell frequencies are below 5 that can make the calculations suspect.  There is also some discussions on having at least 20 responses.