Filter groups allows you to filter samples or cells in order to perform downstream analysis on a subset of data. 

To invoke Filter filter groups, click a count matrix or single cell counts data node, click the Filtering section of the toolbox, and choose Filter groupsto Filter samples (bulk data) or Filter cells (single cell data).  

The Filter groups dialog lets you build a series of filters based on sample or cell attributes. 

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If the attribute is categorical, the third drop-down menu includes is in and is not in as options. A fourth drop-down menu allows you to search and choose from the levels of the selected attribute (Figure 21). 

If the attribute is numeric, the the third drop-down includes:

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The threshold is set using the text box (Figure 32). The input must be a number; it can be an integer or decimal, positive or negative.

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Configuring multiple filters

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The filter groups task report lists the filter criteria and reports feature distribution statistics for the remaining samples (Figure 43). 

If the input was a count matrix data node, the percentage of samples remaining after the filter is listed and charts are provided to show the breakdown of samples by categorical attributes before and after filtering (Figure 54). 

If the input was a single cell counts data node, a second table displays the number of cells retained details from each sample based on the filtered criteria (Figure 65). 

If the input was a classified groups single cell counts data node, the cell count table includes a breakdown by classification and a bar chart is provided to show the number of cells from each classification remaining after filtering (Figure 76). 

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