{"id":9827,"slug":"spotify-african-chart-multi-market-duplication-events","title":"Multi-market duplication events across Spotify’s four published African charts, 13 August to 10 November 2026","source":"Computed from this desk's own retained Spotify chart snapshots for Egypt, Morocco, Nigeria and South Africa","source_url":"https:\/\/kworb.net\/spotify\/","source_type":"computed","method":"Of the 83 consecutive-day pairs compared per market in spotify-african-chart-consecutive-day-duplication-rate, two pairs produced a chart identical at all 200 positions, every artist, title and stream count, in three of the four markets at once: 16 to 17 August 2026 (Egypt, Morocco and Nigeria identical; South Africa not) and 9 to 10 November 2026 (Morocco, Nigeria and South Africa identical; Egypt not). expected_count_if_independent is computed from each market's own observed marginal duplication rate in spotify-african-chart-consecutive-day-duplication-rate (Egypt and South Africa 1\/83, Morocco and Nigeria 2\/83), treating the four markets as statistically independent: for each of the 83 pairs, the probability that three or more of the four markets duplicate simultaneously is the sum, over every combination of three or four markets, of that combination's markets each duplicating (at their own observed rate) and the remaining market or markets not duplicating. Summed and multiplied by 83 pairs, this gives an expected count of 0.00172 such events across the full history. ratio_observed_to_expected is 2 divided by that expected count. This is a model of what independent, unrelated collection faults in four separate markets would produce, built only from this dataset's own observed single-market rates; it is not a claim about what caused either event, which this desk cannot determine from its own collection logs, and the same caveat applies as in chart-snapshot-duplication-check-27-28-august-2026: the comparison cannot distinguish a stale cache on the upstream source from Spotify's own chart not having refreshed.","unit":"count_and_probability","license":"Afrobeats Wire's compilation and analysis are licensed CC BY 4.0. Rights in the underlying source data remain with the source named above.","confidence":"high","retrieved":"2026-11-11 02:06:10","n":7,"first_party":0,"columns":[{"key":"metric","label":"Metric","type":"text"},{"key":"value","label":"Value","type":"number"},{"key":"value_unit","label":"Unit","type":"text"}],"rows":[{"metric":"Consecutive-day pairs where 3 or more of the 4 markets were identical at all 200 positions","value":2,"value_unit":"events"},{"metric":"Event 1: markets identical 16 to 17 August 2026 (of 4)","value":3,"value_unit":"markets (Egypt, Morocco, Nigeria)"},{"metric":"Event 2: markets identical 9 to 10 November 2026 (of 4)","value":3,"value_unit":"markets (Morocco, Nigeria, South Africa)"},{"metric":"Expected number of such events across 83 pairs if each market's duplication were independent of the others","value":0.00172,"value_unit":"events"},{"metric":"Observed number of such events","value":2,"value_unit":"events"},{"metric":"Ratio of observed to expected-if-independent","value":1162.17,"value_unit":"times"},{"metric":"Pairs between one independence-model-predicted event","value":48230,"value_unit":"day-pairs"}]}