Definition

Filtration, in the context of data analysis, is a technique used to segment data based on specific time intervals or geographical locations. This form of filtering enables the examination of variations in data aggregations that may be influenced by factors such as weather patterns or events like high traffic volumes or wildfires. Filtering can be applied by considering time-related criteria (e.g., hours, days, weekdays/weekends, or seasons). For instance, by filtering and comparing the average concentrations of a pollutant like nitrogen dioxide (NO2) across different hours of the day and weekdays versus weekends, one can discern the impact of traffic patterns on local air quality conditions.