# Step 2: Resemblance

For a description of the Bray-Curtis resemblane measure and the rationale for its use with biotic data, see {{@483#bkmrk-clarkeetal2006}} and [Chapter 2](https://learninghub.primer-e.com/books/change-in-marine-communities/chapter/chapter-2-simple-measures-of-similarity-of-species-abundance-between-samples) in '*Change in Marine Communities*'.

1. With the data sheet named '<ins>4th-root</ins>' from the previous step as the active window, click on **Analyse** > **Resemblance**...

[![5._Resemblance.png](https://learninghub.primer-e.com/uploads/images/gallery/2024-02/scaled-1680-/5-resemblance.png)](https://learninghub.primer-e.com/uploads/images/gallery/2024-02/5-resemblance.png)

This dialog has a host of choices for you to consider, which you can uncover by clicking on the '$\bullet$Other' radio button. See {{@483#bkmrk-clarkeetal2006}} and chapter 7 in {{@483#bkmrk-legendrelegendre2012}} for more details regarding the available choices here. For this example, however, we are going to use the Bray-Curtis resemblance measure. (This is the default for data of type 'Abundance').

2. In the 'Resemblance' dialog, under 'Measure', click on $\bullet$Bray-Curtis similarity (the default), then click **OK**.

[![5._Resemblance_dialog.png](https://learninghub.primer-e.com/uploads/images/gallery/2024-02/scaled-1680-/5-resemblance-dialog.png)](https://learninghub.primer-e.com/uploads/images/gallery/2024-02/5-resemblance-dialog.png)

You will see the resulting (lower triangular form of the) matrix of Bray-Curtis similarities between every pair of samples (called '<ins>Resem1</ins>'). 

[![5._Resemblance_achieved.png](https://learninghub.primer-e.com/uploads/images/gallery/2024-02/scaled-1680-/5-resemblance-achieved.png)](https://learninghub.primer-e.com/uploads/images/gallery/2024-02/5-resemblance-achieved.png)

Notice that this will inherit relevant properties and also factors that were associated with the dataset from which it was generated. From the '<ins>Resem1</ins>' matrix as the active window, click on **Edit** > **Properties** to see the properties associated with this resemblance matrix (shown below); you can also click on **Edit** > **Factors** to see the factors (which have not changed).

[![6._Resem_Properties.png](https://learninghub.primer-e.com/uploads/images/gallery/2024-02/scaled-1680-/6-resem-properties.png)](https://learninghub.primer-e.com/uploads/images/gallery/2024-02/6-resem-properties.png)

3. It is (once again) good practice to re-name the sheet containing the resulting resemblance matrix (currently called '<ins>Resem1</ins>') something that would be more useful for future reference. Click on the '<ins>Resem1</ins>' sheet, then click on **File** > **Rename Resem** and call it '<ins>BC_4th-root</ins>' for clarity in ensuing analyses.

[![7_Rename_Resem_a.png](https://learninghub.primer-e.com/uploads/images/gallery/2024-02/scaled-1680-/7-rename-resem-a.png)](https://learninghub.primer-e.com/uploads/images/gallery/2024-02/7-rename-resem-a.png)

[![7_Rename_Resem_b.png](https://learninghub.primer-e.com/uploads/images/gallery/2024-02/scaled-1680-/7-rename-resem-b.png)](https://learninghub.primer-e.com/uploads/images/gallery/2024-02/7-rename-resem-b.png)