{"id":3571,"slug":"african-share-split-sensitivity","title":"African chart share: relative change at every possible split point in the 14-date series","source":"Computed from this desk's african-presence-over-time dataset, 14 collection dates, 13 August to 4 September 2026","source_url":"https:\/\/kworb.net\/spotify\/","source_type":"computed","method":"The 14 dates in african-presence-over-time were sorted chronologically. For each of the 13 possible points between consecutive dates, the series was split into an earlier block and a later block, the unweighted mean of african_share computed within each block, and change_pct computed as the later block's mean divided by the earlier block's mean, minus 1, times 100. This tests whether the -9.2 per cent gap reported between the 6-date and 8-date periods in the body depends on choosing that specific 24\/25 August boundary, by showing what every other possible boundary produces.","unit":"pct","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":"medium","retrieved":"2026-09-04 19:57:22","n":13,"first_party":0,"columns":[{"key":"split_after_date","label":"Split after","type":"text"},{"key":"period1_n","label":"Dates before","type":"number"},{"key":"period1_mean_pct","label":"Mean before, %","type":"number"},{"key":"period2_n","label":"Dates after","type":"number"},{"key":"period2_mean_pct","label":"Mean after, %","type":"number"},{"key":"change_pct","label":"Change, %","type":"number"}],"rows":[{"split_after_date":"2026-08-13","period1_n":1,"period1_mean_pct":2.153,"period2_n":13,"period2_mean_pct":1.991,"change_pct":-7.54},{"split_after_date":"2026-08-17","period1_n":2,"period1_mean_pct":2.169,"period2_n":12,"period2_mean_pct":1.975,"change_pct":-8.97},{"split_after_date":"2026-08-20","period1_n":3,"period1_mean_pct":2.143,"period2_n":11,"period2_mean_pct":1.964,"change_pct":-8.35},{"split_after_date":"2026-08-21","period1_n":4,"period1_mean_pct":2.125,"period2_n":10,"period2_mean_pct":1.953,"change_pct":-8.09},{"split_after_date":"2026-08-22","period1_n":5,"period1_mean_pct":2.125,"period2_n":9,"period2_mean_pct":1.934,"change_pct":-8.97},{"split_after_date":"2026-08-24","period1_n":6,"period1_mean_pct":2.113,"period2_n":8,"period2_mean_pct":1.919,"change_pct":-9.2},{"split_after_date":"2026-08-25","period1_n":7,"period1_mean_pct":2.087,"period2_n":7,"period2_mean_pct":1.918,"change_pct":-8.09},{"split_after_date":"2026-08-27","period1_n":8,"period1_mean_pct":2.072,"period2_n":6,"period2_mean_pct":1.909,"change_pct":-7.85},{"split_after_date":"2026-08-28","period1_n":9,"period1_mean_pct":2.055,"period2_n":5,"period2_mean_pct":1.908,"change_pct":-7.15},{"split_after_date":"2026-08-30","period1_n":10,"period1_mean_pct":2.041,"period2_n":4,"period2_mean_pct":1.906,"change_pct":-6.62},{"split_after_date":"2026-08-31","period1_n":11,"period1_mean_pct":2.031,"period2_n":3,"period2_mean_pct":1.896,"change_pct":-6.64},{"split_after_date":"2026-09-01","period1_n":12,"period1_mean_pct":2.016,"period2_n":2,"period2_mean_pct":1.918,"change_pct":-4.91},{"split_after_date":"2026-09-02","period1_n":13,"period1_mean_pct":2.009,"period2_n":1,"period2_mean_pct":1.916,"change_pct":-4.63}]}