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devpsych-study-design

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Use when designing studies for a Developmental Psychology (APA) manuscript so they can actually support a developmental-change claim. Covers age-appropriate experimental and longitudinal designs, age vs. cohort confounds, attrition, measurement invariance across ages, sample-size justification, and ethics with minors and vulnerable populations. Strengthens the design and pre-analysis plan; it does not write code.

When to use

• Planning cross-sectional, longitudinal, accelerated, micro-genetic, or experimental developmental studies
• Writing preregistration or pre-analysis plans for developmental work
• Addressing age vs. cohort confounds
• Planning for measurement invariance across ages
• Planning for attrition and missing-data models
• Justifying sample size for growth models or age interactions
• Ensuring age-appropriate ethics and task validity

When not to use

• Writing code

Skill page

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