Chi square calculator | Chi-square value calculator
Howtocalculatechi-squarebyhand Chi-squareisnotascomplicatedassomestatisticaltestsandissometimesdonebyhand.Youcanusetheformulabelow,enteringtheobserved(O)andexpected(E)frequenciesforeachgroup.Bysummingupthecalculatedvaluesforeachofthecategories,wecancalculatethechi-squareteststatisticasshownbelow: Onceyouhavecalculatedtheteststatistic,youwouldneedtouseacomputerorachi-squaretabletofindtheapproximatePvalue. Whilethiscanbedonebyhand,thereareseveralopportunitiesfor...
How to calculate chi-square by handChi-square is not as complicated as some statistical tests and is sometimes done by hand. You can use the formula below, entering the observed (O) and expected (E) frequencies for each group. By summing up the calculated values for each of the categories, we can calculate the chi-square test statistic as shown below:
Once you have calculated the test statistic, you would need to use a computer or a chi-square table to find the approximate P value.
While this can be done by hand, there are several opportunities for human error, which is why we recommend this calculator (or Prism for more advanced analysis).
Assumptions of chi-squareWhile chi-square is one of the more flexible tests in statistics, it has the following assumptions:
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