Frequency Plots

frequency plot

Google Ngram viewer provides an interesting frequency plot. Photo by woodlywonderworks

Frequency Plots can tell us a lot about a data set or a process.

Benefits of Frequency Plots

Frequency plots allow you to summarize lots of data in a graphical manner making it easy to see the distribution of that data and process capability, especially when compared to specifications. For example, is our data normally distributed or not?

Frequency plots reveal the spread, kinds of variation, and center of the data without making us do calculations.

They also help detect overlapping processes and sometimes measurement errors.

Types of Frequency Plots

Acceptable Data for Frequency Plots

  • You generally need 50 data points of continuous, non-time ordered data.

Note: You should NOT use time-ordered data in frequency plots.

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