By definition, CDI measures the sales strength of a particular product category within a specific market (e.g., soft drinks among ten- to fifty-year-olds).
The purpose of the CDI metric is to quantify the relative performance of a category within specified customer groups. The Category Development Index helps marketers identify strong and weak segments (usually demographic or geographic) for categories of goods and services.
The CDI is useful in all marketing strategies when used with the Brand Development Index (BDI). The CDI can give vital data for marketers to allocate advertising to specific areas maximizing product category knowledge and profit.
Category Development Index (CDI): An index of how well a category performs within a given market segment, relative to its performance in the market as a whole.
CDI (I) = [Category sales to group (#) ÷ Households in group (#)] ÷ [Total category sales (#) ÷ Total households (#)]
Note: Although defined here with respect to households, these indexes could also be calculated for customers, accounts, businesses, or other entities.
For example, Boston enjoys high per-capita consumption of ice cream. Bavaria and Ireland show higher per-capita consumption of beer than Iran.
- ^ Farris, Paul W.; Neil T. Bendle; Phillip E. Pfeifer; and David J. Reibstein (2010). Marketing Metrics: The Definitive Guide to Measuring Marketing Performance (Second Edition). Upper Saddle River, New Jersey: Pearson Education, Inc.