How Accurate is HyperLogLog++ in GA4?
analyticsThere’s a lot of reasons why your GA4 data may not line up with expectations, but one of the most confusing is HyperLogLog++ (HLL++) cardinality estimation, which is used to estimate user counts. This estimation algorithm shows up in the GA4 UI for all counts whether they are flagged as “sampled” or not, but will […]