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  • Error: Multinomial, multilevel regression - gsem - cannot compute an improvement -- discontinuous region encountered

    I am running a Multinomial, multilevel regression following the "Example 41g — Two-level multinomial logistic regression (multilevel)" guide in Stata.

    I four models with different dependent variables.

    1. gsem (i.harass_BP4_intervene <- i.gender age i.disability i.victim_di_base i.english i.employment i.education financesat i.partner i.owner i.time_interval_rc i.crime_hot se_basescale M1[individualID]@1 ), mlogit
    2. gsem (i.youngpeople_BP4_intervene <-i.gender age i.disability i.victim_di_base i.english i.employment i.education financesat i.partner i.owner i.time_interval_rc i.crime_hot se_basescale M1[individualID]@1 ), mlogit
    3. gsem (i.fight_BP4_intervene <- i.gender age i.disability i.victim_di_base i.english i.employment i.education financesat i.partner i.owner i.time_interval_rc i.crime_hot se_basescale M1[individualID]@1 ), mlogit
    4. gsem (i.suspicious_BP4_intervene <- i.gender age i.disability i.victim_di_base i.english i.employment i.education financesat i.partner i.owner i.time_interval_rc i.crime_hot se_basescale M1[individualID]@1 ), mlogit

    The models work well for the first two variables, but for models 3 and 4 Stata produces the following error. "cannot compute an improvement -- discontinuous region encountered"

    If I run these models without M1[individualID]@1 they work. IndividualID is the level 2 indicator. Is this an issue with my model fit? Why does constraining at level 2 cause issues for some models?
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