relevant products:
  • Optimizely X Web Experimentation
  • Optimizely X Web Personalization
  • Optimizely X Web Recommendations

This article will help you:
  • Change the percentage of total traffic that's eligible to enter your experiment
  • Change what percentage of your experiment traffic sees each variation
  • Stop a variation

By default, Optimizely allocates 100% of visitors to experiments and distributes traffic equally among variations. You can reallocate and redistribute traffic (described below), but we don't recommend this for running experiments. Here's how to send all traffic to a winning variation in an experiment. 

Read on to learn how to control traffic allocation and distribution in Optimizely X.

Re-allocate and re-distribute traffic

To change traffic allocation and distribution for variations in Optimizely X:

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  1. From the Experiments dashboard, navigate to your experiment.

  2. Under Manage Experiment, select Traffic Allocation.

    You can also change your traffic allocation and distribution directly from the Results page. Click Edit Experiment > Traffic Allocation.

  3. In the Traffic Allocation dialog, under Experiment Traffic Allocation, change the percentage of eligible visitors who enter your experiment. If you choose 50%, half of the visitors who land on your page and meet your audience conditions will enter the experiment and be tracked in results.

    Under Variation Traffic Distribution, you can adjust the percentage of traffic that will be bucketed into a particular variation. For example, if you have four variations and the traffic is distributed equally, each new visitor has a 25% chance of being placed into each variation.

    Changes to the traffic allocation and distribution will only affect new visitors. Existing visitors (whether or not they were bucketed in a variation) will keep seeing the same variation, even after you change the traffic allocation or distribution. Visitors who are excluded from the experiment will always be excluded, even if you change the overall traffic allocation to 100%.

  4. Click Save.

If you are changing the traffic allocation from a previously published traffic allocation, Optimizely will add a yellow "changed" label indicating that this traffic allocation has not been published yet.

traffic-allocation-changed.png

You will need to click on "Publish Experiment" for the new traffic allocation to take into effect.

Changing traffic allocation may affect your experiment results and make it difficult to interpret them correctly.

If you set a variation's traffic distribution to 0% (as opposed to clicking Stop), no new visitors will see that variation. However, existing visitors who were bucketed into the variation will keep seeing it. Optimizely will also continue to track the visitors from that variation. 

Stop a variation