Category Development Index (CDI) measures the sales performance of a category of goods or services within a specific group, compared with its average performance among all consumers. By definition, CDI measures the sales strength of a particular product category within a specific market (e.g., soft drinks in 10–50 year old's).
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Purpose
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.
Construction
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.
For example, Boston enjoys high per-capita consumption of ice cream. Bavaria and Ireland show higher per-capita consumption of beer than Iran.