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You asked

Why do my test results not match real-world outcomes?

Experiments show wins but results don’t hold up.

Symptom

At plus twenty-three percent, the multivariate test result looks like a clear win.

Cause

The mechanism is a test design mismatch.

Impact

Programs that run multivariate tests on pages without sufficient traffic to reach significance across all combinations produce directional results that are treated as statistically

Full diagnostic context

Experiments show wins but results don’t hold up.

At plus twenty-three percent, the multivariate test result looks like a clear win.

The mechanism is a test design mismatch.

Programs that run multivariate tests on pages without sufficient traffic to reach significance across all combinations produce directional results that are treated as statistically