Which statement about the impact of pools on data is true?

• A. Pools have no effect on data interpretation
• B. IBNR treatment is always standard
• C. Participation is fixed
• D. Schedule P includes voluntary and involuntary pools, and many pools record IBNR as case reserves, with participation changing over time

Answer: (D)

Pools change how data are interpreted because they bundle multiple insurers together and bring their own reserve practices into a single pool report. Schedule P—the annual statement schedule that collects loss data—includes information on both voluntary and involuntary pools. In many pools, IBNR is recorded as part of the pool’s case reserves rather than as a separate line, which affects how losses and reserves appear in the data. Participation in pools is not fixed; insurers can join or leave pools over time, so which companies are in a pool—and how much each contributes—can vary from year to year. These factors mean data from pools look different from standalone insurer data and require understanding of pool composition and reserve treatment. Thus, the statement describing voluntary and involuntary pools, IBNR being recorded as case reserves in many pools, and changing participation over time is true.