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Some of the methods in Table 4.3 generate text or images; others generate numerical data. There are a wide range of qualitative and quantitative methods for analyzing both types of data. The suggestions for further reading in Table 4.3 provide guidance on appropriate analytic methods for specific types of data. For a comprehensive approach to the analysis of qualitative data, see Bernard et al. (2017). For a guide to quantification in ethnographic research and the “five things you need to know about statistics,” see Dressler (2016). And for a practical guide to the systematic analysis of qualitative and quantitative data, see Dengah et al. (2021).

One example will illustrate the value of having a flexible toolkit of analytic methods. Yoder (1995) explored how mothers of small children in Lubumbashi, Zaire, diagnosed and treated childhood diarrheal diseases. The data he collected were typical of what many medical anthropologists collect. He began with unstructured, open-ended interviews with small groups of mothers, initially attempting to get as complete a list as possible of all the childhood illnesses mothers knew. Later, he probed for detail about symptoms and treatments and eventually identified six illnesses related to the biomedical category of diarrhea: kuhara, kilonda ntumbo, lukunga, kasumbi, buse, and kantembele. Last, he asked new groups of mothers specifically about symptoms, causes, and treatments associated with these six illnesses. Based on qualitative analysis of mothers’ descriptions, Yoder (1995) concluded that mothers’ diagnoses were based on the perception of symptoms and that ethnomedical classification shaped treatment decisions.

Because Yoder published tables of raw data from the mothers’ descriptions, he and collaborators were later able to extend the analysis using other methods. Ryan et al. (2000) conceptualized Yoder’s data as a series of linked lists. Yoder had collected 106 descriptions of the six illnesses. In each description, women discussed the symptoms, causes, and treatments associated with the illness. Ryan et al. converted women’s descriptions into a set of matrices that indicated whether a particular symptom, cause, or treatment was mentioned in each illness description.

Figure 4.5 illustrates the steps in analyzing the relationship between illness and symptoms. The list on the left indicates which symptoms were associated with each description. For example, the women in the first group said that kuhara was associated with frequent stools, vomiting, fever, and no appetite. The matrix on the upper-right converts the textual data into a series of ones (if a symptom was mentioned) and zeros (if it was not). This matrix contains all the information in women’s original descriptions about which symptoms go with which illnesses – although the table of ones and zeros hardly clarifies anything on its on. The trick is that, once the data are in this format, Ryan et al. could use correspondence analysis (Weller and Romney 1990) to visualize the relationships between illness descriptions and symptoms.

Figure 4.5 Steps in analyzing explanatory models of illness, based on Yoder (1995) and Ryan et al. (2000).

In the graph in Figure 4.5, each solid circle represents a symptom; the other symbols represent individual illness descriptions by groups of women. The closer any two points appear together, the more strongly they are associated with each other. Thus, sunken palate and tongue clacking were often mentioned together, and both were associated with descriptions of lukunga. “Frequent stools” are associated with kilondo ntumbo and kasumbi, but women were more likely to mention “very frequent stools” in descriptions of kuhara and buse. The large ovals are 95% confidence intervals that reflect how much the groups of women agreed with one another about which symptoms go with which illnesses.

This analysis is no substitute for Yoder’s original ethnography, of course. But it does add new insight about the level of intracultural variation, the coherence and boundaries of illness categories, and the amount of overlap in symptoms associated with different illnesses. Sibley et al. (2007) recently used the same approach to analyze women’s descriptions of postpartum health problems in Bangladesh. In both cases, the transformation of words into numbers, numbers into pictures, and pictures back into words reminds us of how counterproductive it is to divvy research methods into either qualitative or quantitative.