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Experiments with Predictive Long Term Guardrail Metrics

Published: 15 February 2022 Publication History

Abstract

Product experiments today need a long term view of impact to make shipping decisions truly effective. Here we will discuss the challenges in the traditional metrics used in experiment analysis and how long term forecast metrics enable better decisions.
Most tech companies such as Google, Amazon, Netflix etc run thousands of experiments (also known as A/B test) a year [1]. The aim is to measure the impact new features have on core Key Predictive Indicators (KPIs) before deciding to launch it to production.
Traditional A/B testing metrics will usually measure the impact of the feature on core KPIs in the short-term. However, for many lines of business (such as loyalty and memberships), this is not enough, as we want to understand the impact of the features in the mid/long term. This reality can force companies to run experiments to 6+ months duration, or use a correlated leading metric (such as user activity, engagement level) with estimated impact in the long term. Both these situations are not ideal, the first slows down the rate of innovation while the second does not account for multiple factors that define the future results.
At Lyft, this reality is shared, and one that becomes a challenge for innovation as we need to know the long term impact before we decide to ship new features. As a solution we design forecasted metrics for retention and revenue at a user level that can be used to measure the impact of experiments in the long term. In this talk we will discuss challenges and learnings from this approach, when applied in practice.

Reference

[1]
Why These Tech Companies Keep Running Thousands Of Failed Experiments https://www.fastcompany.com/3063846/why-these-tech-companies-keep-running-thousands-of-failed

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    cover image ACM Conferences
    WSDM '22: Proceedings of the Fifteenth ACM International Conference on Web Search and Data Mining
    February 2022
    1690 pages
    ISBN:9781450391320
    DOI:10.1145/3488560
    Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for third-party components of this work must be honored. For all other uses, contact the Owner/Author.

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    New York, NY, United States

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    Published: 15 February 2022

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    1. causal inference
    2. customer lifetime value

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