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The 'goodness-of-fit' Chi-square is calculated where Observed and Expected
frequencies are compared for each of k categories. Expected frequencies can be calculated in three ways: (1) from a mathematical distribution, (2) from a simple ratio, or (3) from a contingency table. Degrees of freedom in the Chi- square is dependent upon which method is used to calculate the expected frequencies. In order to be compared to a Chi-square the expected frequencies should not be too small, i.e. not more than 20% less than 5. |