Frequency Histogram in Excel
What is a Frequency Histogram?
Like a histogram, frequency histograms show the spread or dispersion of data. Rather than sort the values into bins, a frequency histogram has one bin per value.
A frequency histogram uses variable data to determine process capability. The customer's upper specification (USL) and lower specification limits (LSL) determine how well the process delivers on customer requirements.
In the frequency histogram graph above, all measurements fall between the LSL and USL which means that the process always delivers on the customer's requirements.
Why Use a Frequency Histogram?
Use a frequency histogram whenever the data has a limited number of specific values (e.g., 0.65, 0.60, 0.55). This will show exactly how many of each value are in the sample.
Please note: If you are asked by QI Macros for a "Subgroup Size," a subgroup is a group of measurements produced under the same set of conditions.