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

To invoke Filter groups, click a count matrix or single cell counts data node, click the Filtering section of the toolbox, and choose Filter groups.  

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

Click Finish to apply the filter. If no sample or cell will pass the filter criteria, a warning message will appear and the task will not run. 

Configuring a filter

The first drop-down menu allows you to choose to include or exclude based on the specified criteria. 

The second drop-down menu allows you to choose any categorical or numeric attribute to use for the filter criteria. 

If the attribute is categorical, the third drop-down menu includes "is" and " and is not" as  as options. A fourth drop-down menu allows you to choose from the levels of the selected attribute (Figure 2). 

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

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Configuring multiple filters

Using the OR and AND options, you can combine multiple filters. 

When combining multiple filters all set to Include:

With AND, if all statements must be true for the sample to meet the filter criteria.

With OR, if any statement is true, the sample will meet the filter criteria.  

When combining multiple filters all set to Exclude:

With AND, if any statement is true, the sample will meet the filter criteria.

With OR, all statements must be true for the sample to meet the filter criteria.

Filter groups task report

The filter groups task report lists the filter criteria  criteria and reports feature distribution statistics for the remaining samples (Figure 4). 

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