Often, you want to show a table that counts the total volume across all respondents for a question, rather than the frequency of the volume for that question. In such cases, you don't necessarily want to know how many people chose each type of product, but you want to know the summed volume across all respondents.
Volumetric tables weight each respondent by its volume; instead of counting each respondent as 1, a respondent is counted by the volume indicated in the respondent's answer. Often, volumetric and frequency tables are run on the same question, since they each give different kinds of valid information.
Volumetric tables deal with questions in which a respondent is required to supply a number to indicate, for example, ‘how much?’ or ‘how often?’. For example, the respondent might be asked about total trucks, total household members or total brands purchased. Following are two examples of questions and how their data would appear in both Frequency and Volumetric tables.
Examples of Volumetric and Frequency tables
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