warning
The warning of the design review's entry gate, or null when there is nothing to warn about so that a caller cannot print an empty warning.
The gate warns and proceeds; it never refuses. Refusing would be both paternalistic and sometimes wrong — a mixture fitted to unimodal data with a known mechanism is exactly the case where the method earns its keep, and the analyst knows about the mechanism and the tool does not.
Parameters
has
whether the analyst has a priori reason to believe in a mixing mechanism, which the library takes as an argument rather than asking
level
the significance level for the modality test