Measure retention
Retention is the share of a fixed starting group that bought again within a stated window; newcomers stay out of it, and the share who did not return is the question to investigate.
About 40 minutes8 activities 紙の教材
Retention is the share of a fixed starting group that bought again within a stated window; newcomers stay out of it, and the share who did not return is the question to investigate.
About 40 minutes8 activities 紙の教材