From the triangle to the pie
Causality. Some causality models and some of their components are described: component cause, necessary cause and sufficient cause.
Science without sense...double nonsense
Evidence Based Medicine pills
Science without sense...double nonsense
Evidence Based Medicine pills
Category Epidemiology
The hare and the tortoise
Hazard ratio. The hazard ratio represents the risk of presenting an event, with respect to the control group, in the next instant of time.
Twisting parallels
Crossover clinical trial. Crossover clinical trial allows each patient to receive the study and the control interventions, in a specific order and for a set time.
More than one rooster per pen
Factorial clinical trial. Factorial clinical trial allows testing more than one intervention with only one sample of participants. The clinical trial is the king of epidemiological designs. But it is also the most expensive to perform. And, in our times,…
The gregarious one
Cluster clinical trials. Cluster clinical trials are randomized trials in which the unit of randomization is not the individual, but groups of individuals.