In urban geography, the functional classification of cities seeks to identify the dominant economic and social activities that characterize different urban centers. The statistical method is one of the most systematic and objective approaches used for this purpose, as it relies on quantitative data rather than descriptive impressions. This method classifies cities on the basis of measurable indicators, most commonly employment or occupational structure, thereby revealing the functional role a city plays within a regional or national urban system. The statistical method primarily uses data related to the distribution of the working population among different economic sectors such as primary, secondary, tertiary, and quaternary activities. Census data are the most important source, as they provide detailed information on the number and proportion of workers engaged in agriculture, manufacturing, trade, transport, administration, education, and other services. By analyzing these proportions, geographers can determine which activity dominates the urban economy. For example, a city with a very high percentage of workers in manufacturing is classified as an industrial city, while one with a predominance of workers in trade and transport is identified as a commercial city. One widely used statistical technique within this