delete the Warning in chisq.test(chisq.mat): Chi-squared approximation may be incorrect

[eprifti]

## Warning in chisq.test(chisq.mat): Chi-squared approximation may be incorrect

## Warning in chisq.test(chisq.mat): Chi-squared approximation may be incorrect

## Warning in chisq.test(chisq.mat): Chi-squared approximation may be incorrect

## Warning in chisq.test(chisq.mat): Chi-squared approximation may be incorrect

## Warning in chisq.test(chisq.mat): Chi-squared approximation may be incorrect

## Warning in chisq.test(chisq.mat): Chi-squared approximation may be incorrect