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The term refers to a sequence of numbers that show a pattern of increasing values, which aligns with the concept of progression. When discussing the increments between casket prices, they can be understood as values that follow a particular order, contributing to the overall trend or sequence of prices.

In the context of mathematics and statistics, progression can refer to an arithmetic progression where the difference between consecutive terms is constant or follows a specific pattern. This understanding emphasizes the organization of the price increments, helping to analyze how casket prices change and allowing for better comparisons among them.

The other terms do not align with this concept. Indexing generally relates to the method of establishing a reference point within a set of data, quartiling deals with dividing data sets into quarters, and regression pertains to the statistical method used to determine relationships among variables. Thus, the most fitting choice for describing the ordered increments of casket prices is progression.