great expectations error: expect_column_stdev_to_be_between failed standard deviation out of range

TL;DR

Pull the actual standard deviation from the validation result before adjusting the range: compute the column stdev in the warehouse for the same batch, and check whether a unit change, a new segment of rows, or a genuinely wider spread moved it. expectcolumnstdevtobe_between compares the batch stdev against fixed bounds, so any population change moves the statistic even when every individual value is valid.

great expectations error: expect_column_stdev_to_be_between failed standard deviation out of range

Use this when

• The check or run fails with this symptom: expectcolumnstdevtobe_between fails with the standard deviation out of range.
• You are working on a Great Expectations suite that guards a numeric column spread and the failure repeats on the same data or configuration.
• You need the failing rows, rule, or stage isolated before changing thresholds or code.

Not for this skill when

• A column whose spread is expected to grow with a planned population change, where the bounds need a reviewed update rather than a data fix.
• The error text names a different tool, stage, or root cause. Match the verbatim error first and use that skill.

Steps

1. Read the observed value in the validation result and compare it with the configured min and max. Verify: the distance outside the range is known
2. Compute the stdev for the same column over the previous good batches. Verify: the batch where the spread changed is identified
3. Break the failing batch down by the main segment columns and compute stdev per segment. Verify: one segment with a different spread is found or ruled out
4. Fix the cause: correct a unit or scale change at the source, exclude a wrongly included segment in the batch definition, or widen the bounds with a reviewed change. Verify: the expectation passes on a rerun of the same batch
5. Rerun the full checkpoint. Verify: no other expectation on the column regresses

Variant phrasings

expectcolumnstdevtobe_between failed out of range

The shorter phrasing focused on the named failure.

great expectations standard deviation expectation failed

The symptom phrasing a searcher tries next.

column stdev out of range great expectations fix

The variant naming the failing stage or tool directly.

Compatibility: Great Expectations 0.18 and 1.x with expectcolumnstdevtobe_between

Why it happens

Standard deviation is a population statistic. Adding a new customer segment, switching a column from dollars to cents, or including test rows widens the spread, and the fixed bounds from an older population no longer describe the data.

Edge cases / pitfalls

• Stdev is sensitive to a handful of extreme values; check the max and a percentile before concluding the whole distribution moved.
• An empty or tiny batch produces a meaningless stdev; confirm the batch row count before debating the bounds.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_16-SPxKOQVDwcwjvaz5u9Q