It's not clear whether advanced techniques are always appropriate here, but they come in through a natural progression: you start with simple models (linear regression, errors-in-variables regression), these simple models don't quite …. self- reports, to extended longitudinal data on dyads and systems (parent/child; teacher -students; families; therapist-client), to complex genetic designs, psychology is more challenged by having data too complex for standard methods, …

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When are complicated models helpful in psychology research and …