A worked distinction
Two identical aggregated book rows at a price do not necessarily represent twice the available quantity. Likewise, importing the same candle twice can double its volume and bias a volume-weighted reference.
What to verify in your own analysis
Reject contradictory duplicates, preserve documented update semantics and record any aggregation rule. Do not silently bridge missing time periods when a model assumes regular spacing.
Write down the market or protocol identifier, units, observation window and data source before comparing outputs. Keep unavailable values distinct from zero. Capture a baseline and change one assumption at a time so the resulting difference can be explained.
Use the linked working tools
Open the related tools below to inspect actual public observations or calculate a local scenario. The numerical example above is illustrative, not a current quote. Export the result together with its assumptions if you need a reproducible research record.
The review checklist records what you checked in this tab. Completion measures your own notes, not whether an investment is safe, suitable or profitable.