Filter groups allows you to filter samples or cells 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 "is not" as options. A fourth drop-down menu allows you to choose from the levels of the selected attribute (Figure 2). 

Figure 1. Filtering by a categorical attribute

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

• <: less than
• <=: less than or equal to
• == equal to
• >: greater than
• >=: greater than or equal to

The threshold is set using the text box (Figure 3). The input must be a number; it can be an integer or decimal, positive or negative.

Figure 2. Filtering groups by a numeric attribute

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  and reports feature distribution statistics for the remaining samples (Figure 4). 

Figure 3. Filter groups task report - feature distribution table

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 5). 

Figure 4. Filter groups report - feature distribution table

If the input was a single cell counts data node, a second table displays the number of cells retained from each sample (Figure 6). 

Figure 5. Filter groups - cell classification table

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 7). 

Figure 6. Filter groups - classification bar chart

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