In research, a statistic that helps determine whether the pattern of frequencies found in data assigned to categories is likely due to chance or is atypical. Also used to compare data with a model to determine whether the data’s fit is within the typical range of sampling and chance error. Also used to combine the results of independently conducted studies to determine overall statistical significance, chi-square test.
A statistical test to determine the correlation between the number of actual occurrences and the expected occurrences. The symbol for chi-square is χ².