sessionsby

Sessionsby is a term used in web analytics and data analysis to describe the operation of aggregating or counting user sessions by a specified dimension or attribute. It represents the act of grouping sessions to reveal how engagement distributes across categories such as date, geography, device, traffic source, or user segment.

In practice, sessionsby is implemented as a grouping or aggregation step in a query or reporting tool. It can be realized through SQL GROUP BY clauses, data frame group-by operations in programming languages, or equivalent features in dashboards and analytics platforms. Typical outputs are counts of sessions, sums of session duration, or other session-level metrics broken down by the chosen dimension.

Examples of usage include:

- SQL: SELECT country, COUNT(*) AS sessions FROM sessions WHERE event_date >= '2024-01-01' GROUP BY country;

- Data analysis: group data by device_type and compute the number of sessions per type for a given time window.

- Visualization: show a bar chart of sessions by traffic source over the last 30 days using a sessionsby-like aggregation.

Considerations when using sessionsby include data quality (deduplication of sessions, time zone alignment), sampling in large datasets, and the granularity of the dimension chosen. Clear definitions of what constitutes a session (start and end criteria) are essential for consistent results. Related concepts include grouping, aggregation, cohort analysis, and segment-based metrics.