**glmm: The maximum number of iterations was reached but convergence was not achieved. Output for the last iteration is displayed. The procedure continues despite this warning. Subsequent results produced are based on the last iteration. Validity of the model fit is uncertain.**

I am also sometimes getting this error:

**glmm: The final Hessian matrix is not positive definite although all convergence criteria are satisfied. The procedure continues despite this warning. Subsequent results produced are based on the last iteration. Validity of the model fit is uncertain.**

I have tried increasing the number of iterations, but to no avail; it just seems to exacerbate another problem I'm having, which is that SPSS seems to run forever (sometimes hours) when I use the repeated measures command. This seems to be a problem with the software (https://www.ibm.com/support/pages/r...runs-days-and-have-force-quit-application-mac). I don't mind waiting hours for the model to run, but I'd like to solve the nonconvergence error problem first.

**ANY ADVICE WOULD BE MUCH APPRECIATED!!!**

Currently I have the following syntax:

GENLINMIXED /DATA_STRUCTURE SUBJECTS=SubjID REPEATED_MEASURES=Item /FIELDS TARGET=ResponseTime TRIALS=NONE OFFSET=NONE /TARGET_OPTIONS DISTRIBUTION=INVERSE_GAUSSIAN LINK=IDENTITY /FIXED EFFECTS=Sex Handedness FamilialHandedness PrimeType ProbeLatency Probesize PrimeType

*ProbeLatency FamilialHandedness*ECType FamilialHandedness

*ProbeLatency FamilialHandedness*PrimeType

*ProbeLatency Handedness*PrimeType Handedness

*ProbeLatency Handedness*PrimeType*ProbeLatency USE_INTERCEPT=TRUE /RANDOM USE_INTERCEPT=TRUE COVARIANCE_TYPE=VARIANCE_COMPONENTS SOLUTION=FALSE /BUILD_OPTIONS TARGET_CATEGORY_ORDER=ASCENDING INPUTS_CATEGORY_ORDER=ASCENDING