Why does “N/A” display for some report data?

N/A displays in place of:

• Benchmark data and aggregate mean scores for groups of 10 students or fewer. These groups are too small to support valid statistics.
• State aggregates for any school that's not a U.S. state school.
• District aggregates for any school that’s not part of a public school district or another administrative hierarchy such as an archdiocese.