Register an assay type
Arguments
- name
Assay name
- role
Semantic category (e.g., "location", "variance", "stdev", "z", "t", "F", "df", "n_eff", "p", "chi2", "evidence", "log_evidence", "posterior")
- units
Optional units string/list
- variance_of
Optional name of the assay whose variance this represents
- derive_from
Optional character vector of prerequisite assays