Stata 15 help for _svy_mkmeff
[SVY] _svy_mkmeff -- Calculation of misspecification effects for survey
where matname identifies the (co)variance matrix from a misspecified fit
of survey data.
_svy_mkmeff is a programming tool that computes misspecification effects
from e(V) and matname and places them in e(meft). The misspecification
(co)variance matname is stored in e(V_msp).
For examples, formulas, and a discussion of misspecification effects, see