Limitations of RCTs
The Analysis of the medical literature page has been updated with some additional information about the limitation of RCTs.
Research
Propensity matched studies
A segment on propensity matched studies has been added to the Experimental design page.
Appropriate values of alpha
Some additional information about factors affecting the appropriate level for alpha (p value) has been added to the Inferential statistics page.
P value ‘trends’ and extra data
Some extra information about the effects of extra data and repeat studies on p values has been added to the Analysis of the medical literature and the Inferential statistics pages.
Higgins I squared test
Information about Higgin’s I squared test has been added to the Comparison of variables between two groups page.
Cochrane’s Q test
Additional information about Cochrane’s Q test has been added to the Comparison of variables between two groups page.
Effect of stopping trials early
The Medical literature page has been updated with information about how stopping trials early due to a positive treatment effect usually overestimates the treatment effect.