{"as_of":"2026-10-20","site":"https://oiltrace.tw","property_label":"油跡可循","report":"Traffic acquisition: session primary channel group, with full calendar date secondary dimension","timezone":"GMT+08:00 Taiwan time (read from property details)","requested_range":{"start":"2026-07-01","end":"2026-10-19"},"first_observed_date":"2026-07-15","last_observed_date":"2026-10-19","reported_totals":{"sessions":13232,"engaged_sessions":6322,"event_count":58061},"daily_channel_row_sums":{"sessions":13245,"engaged_sessions":6314,"event_count":58061},"channel_row_sums":{"sessions":13112,"engaged_sessions":6311,"event_count":58061},"counting_method":"Daily and period comparisons sum the exported date-by-channel session estimates. These are not separately deduplicated period totals.","estimation_reference":"https://developers.google.com/analytics/blog/2022/hll","peak_day":{"date":"2026-07-16","sessions":4138,"engaged_sessions":2282,"event_count":19183},"first_week_after_first_observation":{"start":"2026-07-16","end":"2026-07-22","days":7,"sessions":10828,"sessions_per_day":1546.857142857143},"last_seven_days":{"start":"2026-10-13","end":"2026-10-19","days":7,"sessions":100,"sessions_per_day":14.285714285714286},"change_first_week_to_last_week_pct":-99.0764684152198,"periods":[{"start":"2026-07-15","end":"2026-07-31","days":17,"sessions":11748,"sessions_per_day":691.0588235294117},{"start":"2026-08-01","end":"2026-08-31","days":31,"sessions":772,"sessions_per_day":24.903225806451612},{"start":"2026-09-01","end":"2026-09-30","days":30,"sessions":466,"sessions_per_day":15.533333333333333},{"start":"2026-10-01","end":"2026-10-19","days":19,"sessions":259,"sessions_per_day":13.631578947368421}],"channels":[{"channel":"Direct","sessions":7709},{"channel":"Organic Search","sessions":3384},{"channel":"Organic Video","sessions":1104},{"channel":"Organic Social","sessions":718},{"channel":"Referral","sessions":167},{"channel":"AI Assistant","sessions":21},{"channel":"Unassigned","sessions":9}],"limitations":["GA4 uses HLL++ distinct-count estimation. The report total (13232), channel-only row sum (13112) and date-by-channel row sum (13245) are retained separately; these estimates are not forced to be additive. Their difference alone does not establish a tracking error or explain any particular discrepancy.","Sessions are GA4-defined visits, not distinct people, searches, affected purchasers, exposure or disease outcomes.","The first observed collection day may be partial; the initial 7-day comparison starts the next day. This does not establish the historical collection completeness or launch date.","No data before the first observed date are treated as zero public interest.","Consent, blockers, tagging, bot filtering, internal traffic, outages and identity methods were not independently validated. The UI displayed 100% available data; that does not establish complete population coverage.","The site is an office-associated advocacy tool. Traffic self-selects and is affected by publicity, links, algorithms, seasonality and site changes.","Peak-to-later decline alone does not identify intentional government/media diversion or its cause. No counterfactual control or media-content causal analysis is supplied.","Page views may be affected by client-side query changes. Session counts are reported separately from page views and event counts.","Raw export headers, account/property identifiers and user-location details are not part of the public release."]}