meta analysis?
researcher looks at findings from number of different studies and produces a statistic to measure overall effect
effect size?
this technique produces an effect size of the dv in order to assess overall trends
examples of meta analysis?
kohnken et al: cognitive interview vs standard police interviews
anderson et al: correlational, experimental and longitudinal research into video game violence linkes to aggression
strengths?
cheap,
quick to collect data,
can see trends,
minimise anomalies,
weaknesses?
not truly comparable,
conclusions not always valid,
takes time to analyse