the colour scale on this chart
The discrepancy between the two methodologies for calculating retention — the 30-day rolling window versus the cohort-based approach — suggests we're measuring different populations entirely.
The Moscow reclassification in 2012 incorporated several surrounding municipalities, officially increasing the city boundaries. Our data shows the jump at the correct time, but there's no bridge data to separate the organic growth from the territorial expansion. Should we add a footnote explaining that 2012 is not comparable to earlier years, or do we need to restate the pre-2012 data on the new geographic basis?
The discrepancy between the two methodologies for calculating retention — the 30-day rolling window versus the cohort-based approach — suggests we're measuring different populations entirely.
Excellent presentation. See /u/plg_thranduil_whitfield/p/plot-0085.