Be careful in how you aggregate multiple values (for instance, URLs with different session IDs that are really the same page) from the metrics system into your content analysis.
Note that lower level fields may sometimes be needed to compute more useful fields. Also, sometimes the higher level fields may be more difficult to compute, so they are not always worth it.
Chimera allows either direct ingestion from metrics tools or merging from a spreadsheet, in all cases aggregating values that represent the same page.