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Missing value

Missing value: A blank in our data means unknown. It never means zero.

How we measure it

When a source does not show a value we leave it blank, with a reason where we know one.

What it is not

It is not zero. A price cut field, for example, is 1 when the listing shows a cut, 0 when the source shows cuts and this listing has none, and blank when the source never shows them.

Where it appears in the data

Field names as the API returns them; each dataset's page in the API lists the field's type and unit.