How to Build a Balanced Incomplete Design with More than 17 Products

The Balanced Incomplete Design is a design that has an equal number of observations but not all treatments can be assigned to each block, set or session. This can be used to create a design that contains more products than product presentations. For example you have 5 products but only want to present 3 products to each panellist. Keep in mind to always specify a number of treatments that is less than the number of products.

Within EyeQuestion, by using the design generator it is currently not possible to generate a Balanced Incomplete design containing more than 17 products. However it is possible to create it by following the steps below:

Step 1. 

Create a balanced design including all products you want to evaluate (e.g. 40 products). Define in this step if the design should be monadic sequential or block design by selecting this option under "Multi Product". Click Generate Design.

Step 2. 

Export your design by clicking to Design>Files to Import Design>Excel .

Step 3. 
Open the Excel file and remove the columns of the samples you do not want to include. For example, if you want the panelists to evaluate only 20 out of the 40 products, delete the columns for samples from 21 onwards.

Step 4.

Go back in EyeQuestion and click Design>Import Design and select the excel file you just created.

Once the design is imported you will obtain the correct balanced incomplete design.

• Related Articles

• Design Types Available in EyeQuestion

  Introduction EyeQuestion provides a diverse range of design types to meet your every need. On the "Design Type" tab within the Design Generator, you can select from various design options. This page offers an overview of each design type available. ...

• Workspace: Design Page

  Introduction Welcome to the Design section of EyeQuestion, where the structure of your questionnaire takes shape. This crucial page is where you determine the order in which panelists will evaluate the products. Each template provided within this ...

• How Do I Generate an Experimental Design

  In EyeQuestion you can generate different kind of experimental design. Some experimental designs are already included in the application, while specific ones can be imported. In the following article you will find more information on this kind of ...

• How to Create a Multi-Design Project

  Introduction Multi-design projects serve as tools for conducting comprehensive evaluations across various dimensions. For instance, they prove particularly useful when there's a need to systematically assess different aspects of products. Consider a ...

• Add Warm Up Sample

  Introduction In sensory testing, ensuring that panellists are familiar with the product or testing flow is crucial for obtaining reliable data. This is where a warm-up sample comes into play. A warm-up sample is a non-evaluative sample placed at the ...