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...tput was this Analysis of Single Table An expected cell is <5. *Chi square is not valid.* Chi square = 43.81 2 degrees of freedom P<0.00000000 <-- ..................................... In OpenEpi the output was like this Single Table AnalysisVar 2 39 544Var 1221 2311213 621880 Chi Square for R by C Table ------------------------------ Chi Square=43.81Degrees of Freedom=2p-value= <0.0000001 Cochran recommends accepting the chi square if: 1. No more than 20% of cells have expected < 5.2. No cell has an expected value < 1. In thi...