1.2 The data: two qualitative variables

Consider data (Gammon et al. 2012) in Exercise 31.16 of the textbook (shown here in Table 1.1).

The data file (B12-Long.csv) can be downloaded in Sect. 11. You can download the data, and follow the instructions.

The data has two qualitative variables being measured on each individual:

Whether the person is vegetarian (or not);
Whether the person is B12 deficient (or not).

Hence, jamovi will have two columns: one for each variable. There are \(124\) units of analysis, so there are \(124\) rows of data.

TABLE 1.1: The number of vegetarian and non-vegetarian women who are (and are not) B12 deficient.
	B12 deficient	Not B12 deficient	Total
Vegetarians	8	26	34
Non-vegetarians	8	82	90
Total	16	108	124

References

Gammon, Cheryl S., Pamela R. von Hurst, Joan Coad, Rozanne Kruger, and Welma Stonehouse. 2012. “Vegetarianism, Vitamin B12, and Insulin Resistance in a Group of Predominately Overweight/Obese South Africian Women.” Nutrition 28: 20–24.