Histogram

A Histogram is used for the clear presentation of large, complex data sets and facilitates the assessment of data distribution by organizing the data and determining process variation. Data that has already been collected is sorted into classes based on their target values and tolerance limits, all in the same unit of measurement. To determine which classes individual values should be assigned to, the range (R), the number of classes (k), and their width (h) must be calculated. The X-axis is scaled according to the class width, while the Y-axis, once all values are assigned to categories, shows the frequency with which each class occurs.