The Aggregate command is used to manually re-calculate the coverage aggregates from the command line, which provide the coverage statistics for each project.
NCover Aggregate --project
--project NCover project name. *REQUIRED* --execution Specify execution by Caption, Build Id, or Date. --build-id, --buildid All executions matching Build Id --all Re-aggregate all executions --enable Enable local aggregation for project --disable Disable local aggregation for project --recover Recover all executions even if they have errors. --pn, --pre-aggregate-new Update missing pre-aggregation only --pf, --pre-aggregate-force Force update all pre-aggregation only