Measurement
How does a before and after comparison work?
A before and after comparison works by examining comparable observations collected before and after a defined change.
The change and observation conditions should be clear. Otherwise, differences in questions or collection can obscure what the comparison shows.
An observed improvement is not automatically caused by the fix. Other changes and ordinary variability remain possible explanations.
In Seenford
For Seenford, this means comparing matched weekly checks before and after a recorded fix, and only reporting movement beyond normal week-to-week variation when enough comparable evidence exists.
Example
A business compares answers around a correction to its public coverage information.
Related terms
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