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Mplus Users Guide v6.. - Muthén & Muthén

Mplus Users Guide v6.. - Muthén & Muthén

Mplus Users Guide v6.. - Muthén & Muthén

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CHAPTER 16such that convergence is obtained when PSR < a for each parameter.The factor value ranges between one and two depending on the numberof parameters. With one parameter, the value of factor is one and thevalue of a is 1.05 using the default value of BCONVERGENCE. With alarge number of parameters, the value of factor is 2 and the value of a is1.1 using the default value of BCONVERGENCE.With a single chain, PSR is defined using the third and the fourthquarters of the chain. The first half of the chain is discarded as a burninphase. To request a stricter convergence criterion, specify:BCONVERGENCE = .01;BITERATIONSThe BITERATIONS option is used to specify the maximum number ofiterations for each Markov chain Monte Carlo (MCMC) chain when theGelman-Rubin convergence criterion (Gelman & Rubin, 1992) is used.The default is 50,000. To request more Bayes iterations for each chain,specify:BITERATIONS = 60000;FBITERATIONSThe FBITERATIONS option is used to specify the fixed number ofiterations for each Markov chain Monte Carlo (MCMC) chain when theGelman-Rubin convergence criterion is not used. There is no default.When using this option, it is important to use other means to determineconvergence. To request a fixed number of iterations for each Markovchain Monte Carlo (MCMC) chain, specify:FBITERATIONS = 30000;THINThe THIN option is used to specify which iterations from the posteriordistribution to use in the parameter estimation. When a chain is mixingpoorly with high auto-correlations, the estimation can be based on everyk-th iteration rather than every iteration. This is referred to as thinning.562

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