Hello,

I used the RidgePlot to make the plot. What is the definition of "Identity", what is the mean of the "identity"? Is that possible I can delete "Identity"?

    RidgePlot(Plasma, features = c("UCP2"), group.by="tech", ncol = 3)

Thank you in advance for your great help!

Please see attached file

Thank you!

Best,

Yue

<a href="https://imgbb.com/"><img src="https://i.ibb.co/34jC86Z/Screenshot-from-2020-08-27-03-58-17.png" alt="Screenshot-from-2020-08-27-03-58-17" border="0" /></a>
Hi, 

`Identity` is the identity of the cells in scRNA-seq data. It's not directly related with this plot, but with scRNA-seq data in general. So, the `identity` is any factor/categorical variable that describes each cell. The `identity` of the cells can be the sample, replicate, condition, cell cluster to which they belong to. 

In your case it seems to be `condition` or `sample`. But you can set the `identity` to cell clusters/populations/types any variable that annotates each cell to a factor/categorical variable. 

You can see the `identity` of your cells by typing: 

    Idents(pbmc) # assuming that pbmc is your seurat object

You can set the `identity` of your cells to another variable in your seurat object by doing: 

    Idents(pbmc) <- "replicate"

Where `replicate` is a variable in your seurat object - "pbmc" - annotating each cell as `rep1` or `rep2` (see the example here: https://satijalab.org/seurat/v3.0/interaction_vignette.html ). 

I hope this answers your question, 

António