## Questions.

Using the dat.raudenbush1985 from week 3. Rerun the random-effects meta-analysis with REML estimation from the earlier exercises.

• Perform subgroup analyses with tester blindness (tester): build one model with a common $$\tau^2$$ estimate and one without. What do you conclude?
• Perform a meta-regression with publication year (year). Center the year variable first. Make a bubble plot illustrating this meta-regression. What do you conclude?
• Perform a permutation test with 5000 shuffles for the meta-regression with publication year. What do you conclude?
• Build a meta-regression model with tester blindness (tester) compare it to the meta-regression which contains both tester blindness (tester) and centered publication year (year). What do you conclude?
• Build an interaction model between tester blindness and publication year. What do you conclude?