IQ checklist (1)

IQ checklist:

- range restriction
- selection effects (Berkson's paradox or unrepresentative groups like Mensa)
- differing levels of measurement error:

    - comparing different constructs
    - tests of different lengths
    - sum scores vs factor scores
    - subtests vs full-scale tests
- claims of IQ changes due to environment or intervention:

    - fadeout over time
    - failure of test invariance: post-test factor analysis shows gains are subtest-specific or on factors other than claimed
    - demand + motivational effects (non-blinded/passive control groups eg in dual n-back)
- controlling for intermediate variables/'Everest regression': adding moderators/covariates which are correlated with IQ without acknowledging the (often dubious) causal model this corresponds to
- group comparisons not adjusted for Flynn effect or Wilson effect (spurious gains/losses or differences in heritabilities)
- lack of genetically-sensitive design while investigating causal questions