Test and Roll Calculator

Profit-Maximizing A-B tests

by Elea McDonnell Feit and Ron Berman

Developed by Kevin Harrison and Spencer Ross

Population and Sample

Population Size (N)

User-Selected Sample Size in Each Group (n)

Optimum sample size (Test and Roll):

Priors and Posteriors

Posterior Standard Deviation (s)

Prior Mean (mu)

Prior Standard Deviation (sigma)

Hypothesis Testing Parameters

Minimum Detectable Effect (Delta)

Confidence

Power

Traditional Recommended Sample Size:

Legend:

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Copyright 2019 Elea McDonnell Feit, Ron Berman, Kevin Harrison, and Spencer Ross

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this software except in compliance with the License.

You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.