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
Category Epidemiology
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.
You make your bed, you lie in it
Case-crossover studies. Case-crossover studies focus on the event and try to see something that favors it, comparing the exhibitions of immediate with previous moments.