A Short Guide to Metrics

Simple rules to follow when creating metrics

  1. Over time: You must see how metrics change over time. Ideally you can view them by day, week, and month. No pie charts!
  2. In groups: Metrics require balance. Think of the extremes. If you over-optimize for one metric, what problem will it create?
  3. Weighted appropriately: If different times of the week or geographic areas are more important, your metrics should reflect this.
  4. Robust: Chances are your data is not pristine. Be careful of outliers. Median or percentile can be better than the mean.
  5. Keep it simple: People should be able to understand the metric.

Nice to have

  1. Responsive: Prefer metrics that change quickly as a result of your actions.

Published November 5, 2017 · Tweet

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