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statistics survey methodology latent class analysis mixture models latent variable modeling reliability clustering validity mixture modeling model fit model selection big data latent variables official statistics latent variable misclassification social science measurement error questionnaire design sqp meta-analysis polling european social survey expert systems question design data exhaust questionnaires incidental data local dependence privacy differential item functioning measurement invariance sensitivity analysis differential privacy social media data science complex survey irt complex sample structural equation model item response theory weighting stratification variance estimators stratification complex sampling weighting data analysis r-project multistage surveys sandwich estimators complex surveys structural equation modeling r open source methodology administrative data veracity register data