Regular customers
Re-randomization in clinical trials. Re-randomization is the ability to randomize trial participants on more than one occasion, useful when large samples are required.
Science without sense...double nonsense
Evidence Based Medicine pills
Science without sense...double nonsense
Evidence Based Medicine pills
Read MoreRegular customers
The fairground shotgun
Random error and systematic error. We describe two types of errors, the random error due to measurement randomness and inaccuracies, and the systematic error or bias.
Together but not in each other’s pockets
Hybrid designs The main observational hybrid designs are described: cohort nested cases and controls studies and cohort and case-control studies.
Generalizations are hazardous
Berkson’s fallacy. Berkson’s fallacy is described, which occurs when we find a spurious association between two variables due to a improper sample.
Do not be misled by the outliers
Robust scale parameters. We describe robust scale parameters, such as the median absolute deviation or the winsorized standard deviation, less susceptible to extreme values.