compareGroups: the chosen test had too little to work with (too few values, or no variation).

Warnings reference › compareGroups:degenerate

Identifier

compareGroups:degenerate

Raised by

The grid (core)

Since

1.27.0

What happened

The test ran and could not produce a statistic: too few values in one group, or no variation at all within them (every value identical, so the variance is zero). null is returned rather than a p-value computed from a degenerate sample.

The fix

Compare groups with more rows, or check that the measure actually varies within them.

Reference

Covered in full at the API reference.