A histogram is used to graphically summarize and display the distribution of a process data set. A histogram can be thought of as a simplistic kernel density estimation, which uses a kernel to smooth frequencies over the bins. Histograms are sometimes confused with bar charts. A histogram is used for continuous data, where the bins represent ranges of data, while a bar chart is a plot of categorical variables. Histogram is a type of bar chart representing the frequency distribution of the data from a process. Only one parameter can be used for constructing this chart. For using histogram, we need to use histogram worksheet to set up the histogram on graph paper. Histogram worksheet helps in determining the number of bars, the range of numbers that go into each bar and labels for the bar edge. The Seven Steps are as:
- Collect and record the data points
- Compute the range
- Determine the numbers of intervals
- Determine the interval width
- Summarize the data
- Construct the graph
- Analyze the pattern of the chart
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