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📉 Fieller Interval
6/11/2025
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📊 Fieller Interval
You can now opt in to using Fieller Intervals when calculating % lift confidence intervals. This is a more accurate alternative to the Delta Method when calculating % lift confidence intervals.
Because Fieller Intervals are asymmetric, the scorecard display will look slightly different when this option is enabled:
You can set this up in your Experimentation Settings at the Organization Level.
Historical and ongoing experiments will not have their methodology changed midway through if you opt in, only newly created experiments after opt in are impacted.
Learn more about Fieller Intervals here!
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