Missingness

Decide in advance what happens to cases where the data never arrived: dropped, counted as failures, or set aside as unknown. Also set the threshold of absent data at which the number stops being reportable at all.

Decide in advance what happens to cases where the data never arrived: dropped, counted as failures, or set aside as unknown. Also set the threshold of absent data at which the number stops being reportable at all.

Example

On the activation card you write: users who deleted the app before day seven count as not activated; users with tracking blocked are excluded and reported as a separate line. If unknowns pass 5 percent of the cohort, the 18 percent claim does not ship.