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Example Of Contingency Table. The following are illustrative examples of a contingency plan. The 2 x 2 contingency table like the above example is a simple contingency table however contingency tables can have any number of rows and. There are two ways to collect 22 contingency table dataCross-sectional data is collected by randomly samplingnindividuals and cross-classifying them on two variablesExample Askn 143 random individuals two questionssalary highlow and education high-schoolcollegeThe row and column totals are random. For example the above contingency table has two rows and five columns not counting header rowscolumns and shows the results of a random sample of adults classified by two variables namely gender and favorite way to eat ice cream Larson and Farber 2014.
N is a grand total of the contingency table sum of all its cells C is the number of columns. For example in a randomized trial in which the number of subjects to be randomized to each treatment group has been specified the row margins would be fixed. Understanding what the Table is Telling you. Given two variables a. If a third variable is included the three-way contingency table is described as I J K where I is the number of rows J is the number of columns and K is the number of superordinate columns each level containing a 2 2 matrix. Outcome Diet Cancers Fatal Heart Disease Non-Fatal Heart Disease Healthy Total AHA 15 24 25 239 303 Mediterranean 7 14 8 273 302 Total 22 38 33 512 605 As we have mentioned the contingency table is a tool for analyzing two variables.
Later on we will use contingency tables again but in another manner.
Note that for example the table show that 20 Females have Black eyes and that 10 Males have Gray eyes. Figure 77 Example of a Contingency Table Note the following about Contingency tables. On the other hand in a retrospective study where one might sample cases. For example in a randomized trial in which the number of subjects to be randomized to each treatment group has been specified the row margins would be fixed. For example the above contingency table has two rows and five columns not counting header rowscolumns and shows the results of a random sample of adults classified by two variables namely gender and favorite way to eat ice cream Larson and Farber 2014. Note that for example the table show that 20 Females have Black eyes and that 10 Males have Gray eyes.