A minimum aggregation level sets the smallest subgroup size allowed before aggregate results appear in a report. It helps prevent individuals from being identified through small breakouts. section 8.3.3
Apply the level as a reporting guardrail:
- Set a minimum sample size appropriate to the statistical test. section 8.3.3
- Suppress or combine groups with fewer than the permitted number of individuals. section 8.3.3
- Reduce the number of simultaneous breakouts when consistently small groups make reporting unsafe. section 8.3.3
Employee engagement survey
A survey report uses a minimum aggregation level of five. Results for subgroups under five employees are hidden, and small teams receive fewer breakouts, protecting response anonymity. section 8.3.3
Figure 8.13 An employee engagement survey with multiple breakouts can accidentally deanonymize individuals in groups with few members. For example, the sales department has one EEOC group with n=1, making it easy to identify the person and their satisfaction.
Inspect how overlapping breakouts can expose a subgroup with only one person and reveal that individual's satisfaction. section 8.3.3
