Interpreting Box Plots with Questionnaire Data

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SUMMARY

This discussion focuses on interpreting box plots derived from questionnaire data, specifically values ranging from 0 to 10. The key points include that when the median aligns with the upper or lower edge of the box, it indicates that the median equals the respective quartile. Additionally, the presence of only one whisker suggests that a significant number of data points are duplicated at the quartile level, indicating a lack of variability in those measurements.

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  • Understanding of box plot components (median, quartiles, whiskers)
  • Familiarity with statistical concepts related to data distribution
  • Experience with data visualization tools (e.g., R, Python's Matplotlib)
  • Basic knowledge of questionnaire design and data collection methods
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jophysics
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Dear all,
I need to evaluate some data from questionnaires (in the form of scale of values from 0 to 10) and I thought to use the box plots. Please, someone can provide me with some helps (references,etc) for the interpretation? In some cases, the median does not falls inside the box but it is the upper bound of the box, in other cases I have upper or lower wiskers only. What do these mean?

thank you for your help!

jo
 
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If the median is the upper or lower end of a box then the median equals the lower or upper quartile. If you have only a whisker (say the upper whisker) than almost all of the measurements equal the upper quartile and you have one (or more?) values at the maximum.

In short, in both situations, you have good numbers of duplicated data values.
 

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