User L.S.

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About

Data analyst in public health and psychology. MPH in epidemiology and biostatistics. SAS, SPSS and occasional Stata user.

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Notable Question

Oct 15
Yearling

Apr 29

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Quorum

Dec 7, 2021
Curious

Mar 27
Commentator

Nov 23, 2021

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random-effects-model

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mixed-model

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multilevel-analysis

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convergence

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covariance-matrix

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panel-data

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View all questions and answers

Choosing the right modeling procedure

Mar 26

Random slopes in a growth curve analysis

Sep 21, 2021

Is there a model that can handled unbalanced repeated measures data with 1 OR 2 follow ups?

Aug 13, 2020

Change in outcome trajectory over time in treatment vs. control group

May 25, 2021

Choosing between Negative Binomial, Zero-Truncated NB, and NB with Arithmetically Altered Outcome (SAS)

Mar 27

Multilevel model - Hessian matrix not positive definitive error, but only for certain covariance structures

Nov 11, 2021

Conceptual question: Can serial mediation use the same variable at multiple time points? (e.g. depression T1 --> depression T2 --> depression T3, etc)

May 24, 2021

If I am using growth curve analysis with higher order time variables, do they all need to be included as random effects?

Sep 30, 2021

What would be the purpose of including a grouping variable in random effects in a mixed model?

Oct 5, 2021

Mixed model converges with unstructured covariance matrix, but not with more parsimonious covariance structures - Why would this occur? (SPSS MIXED)

Oct 7, 2021