Class Boundary

A class boundary is the dividing line between two adjacent classes or categories in a dataset.It helps to determine the range of values belonging to each category and allows for better analysis and interpretation of the data. When there are data of different categories, there are always upper and lower category limits, i.e., the data set has a minimum and maximum value. When numerical data is grouped into categories (e.g., 1≤ x < 5 、 5 ≤ x < 10, …), and the values marking the boundaries of the categories are called the lower and upper category boundaries.The class boundary is the midpoint between the upper class limit of one class and the lower class limit of the next class.Therefore, each class has an upper class and a lower class boundary. It must be noted that the upper boundary of one class and the lower boundary of the subsequent class are the same. Class boundaries are not part of the dataset.

Understanding class boundaries is essential for effective data segmentation and can provide valuable insights for business planning and strategy development. The concept of class boundaries is fundamental to statistics and data analysis. It plays a vital role in the representation and interpretation of grouped data, especially in the context of histograms and frequency distributions. Over time, the concept has evolved as a way to simplify and summarize data for analysis and visualization.