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Glossary

Baseline

An account's own normal level for a measure, usually the median over a trailing window of twelve weeks or months. Surges and silences are measured against it, not against a global figure.

DefinitionAn account's own normal level for a measure, usually the median over a trailing window of twelve weeks or months. Surges and silences are measured against it, not against a global figure.

Baseline versus norm

The baseline is the account's own history. The norm is what similar accounts do. A surge is against the baseline; a gap is against the norm.

Window length

Too short and normal fluctuation becomes a surge. Twelve periods is the usual floor.

How it is computed

The median of the account's own values over a trailing window, usually twelve weeks or twelve months, excluding the current period. A movement is judged against this, not against other accounts.

Example

An account's weekly orders over twelve weeks have a median of $8,200. This week it ordered $3,100, 38 percent of baseline. Another account at $3,100 has a baseline of $2,900 and is fine.

Where it goes wrong

Using the mean, which one unusual order drags. Or using a baseline so long that a customer who changed a year ago is still compared with what it used to be.