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How to define a custom categorical factor

Updated over a year ago

Often you will want to consider a factor in your design that does not directly map onto a parameter in your workflow. For example, ‘temperature’, ‘pH’ or ‘day of the week’ could be defined as factors - without them being parameters in your workflow.

In this tutorial you will learn:

  • Where to add a custom categorical factor.

  • How to define the volume levels you want to investigate

  • How to set a custom categorical factor as a Quasi-Replicate

  • How to set a custom categorical factor as Hard To Change

  • How to set a custom categorical factor to sample discretely or a range of values.

Defining a custom categorical mixture component factor

Adding a new custom categorical mixture component factor.

  1. Build a workflow that defines a set of liquids and provides those liquids to a Make Mixtures element.

  2. Switch the workflow builder into DOE Mode.

    Note: only the elements that can have DOE factors applied to their parameters will be interactive and display in colour. If the workflow has not already been added to a Synthace experiment you will be prompted to do so before being able to enter DOE mode.

  3. Click on the ‘Design’ button, in the top right-hand corner, to open the DOE design window.

  4. Click on the “ADD” button next to Custom Factors to select a factor type.

  5. Select the “New Factor” Option to open the Factor Definition Panel.

Defining factor properties

  1. In the Factor Definition Panel, click on the Factor Name entry field and enter a custom factor. In this example, Cell Type.

  2. Input the levels you want to investigate for your factor. Click on the “Add New Item” button to add additional levels for your factor.

  3. To treat this factor as a Quasi-Replicate click on the check box. To learn more about Quasi-replicating factors see here.

    Note: making a factor a quasi-replicate will disable the sampling control panel as all quasi replicate factors are sampled discretely at just the levels that were defined above.

  4. To treat this factor as Hard To Change click on the check box. To learn more about Hard to Change factors see here.

    Note: making a factor Hard to Change will disable the sampling control panel as all quasi replicate factors are sampled discretely at just the levels that were defined above.

  5. Click on “Add Factor” to save the factor to your Factor Table where you will see a summary of the factors settings.

Well done on making it to the end of this tutorial.

To learn how to define a custom numerical factor, click here.

To learn about other factor types, click here.

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