<P> The test is useful for categorical data that result from classifying objects in two different ways ; it is used to examine the significance of the association ( contingency ) between the two kinds of classification . So in Fisher 's original example , one criterion of classification could be whether milk or tea was put in the cup first ; the other could be whether Bristol thinks that the milk or tea was put in first . We want to know whether these two classifications are associated -- that is , whether Bristol really can tell whether milk or tea was poured in first . Most uses of the Fisher test involve , like this example , a 2 × 2 contingency table . The p - value from the test is computed as if the margins of the table are fixed , i.e. as if , in the tea - tasting example , Bristol knows the number of cups with each treatment ( milk or tea first ) and will therefore provide guesses with the correct number in each category . As pointed out by Fisher , this leads under a null hypothesis of independence to a hypergeometric distribution of the numbers in the cells of the table . </P>
<P> The test is useful for categorical data that result from classifying objects in two different ways ; it is used to examine the significance of the association ( contingency ) between the two kinds of classification . So in Fisher 's original example , one criterion of classification could be whether milk or tea was put in the cup first ; the other could be whether Bristol thinks that the milk or tea was put in first . We want to know whether these two classifications are associated -- that is , whether Bristol really can tell whether milk or tea was poured in first . Most uses of the Fisher test involve , like this example , a 2 × 2 contingency table . The p - value from the test is computed as if the margins of the table are fixed , i.e. as if , in the tea - tasting example , Bristol knows the number of cups with each treatment ( milk or tea first ) and will therefore provide guesses with the correct number in each category . As pointed out by Fisher , this leads under a null hypothesis of independence to a hypergeometric distribution of the numbers in the cells of the table . </P>
what is the test statistic for fisher exact test
what is the test statistic for fisher exact test
categorical data that result from classifying objects in two different ways ; it is used to examine the significance of the association ( contingency ) between the two kinds of classification
categorical data that result from classifying objects in two different ways ; it is used to examine the significance of the association ( contingency ) between the two kinds of classification