Dear Lazin

I think you must also provide additional information for better contextual analysis.

Thanks

What do you mean by common? a continuous variable?

If your intention is measure magnitude of relationship, try biserial correlation.

Eddie,

 thank you, that is what I am going to do.

viorica

You are welcome Viorica. I hope it helps.

You may also try phi coefficient or contingency coefficient from a 2X2 contingency table. These are chi square-based measures of association.

Ed

Eddie,

You rock!

vi