About pilots
Pilot studies. Pilot studies are carried out before the conventional trial in order to ensure the effect of the intervention and the feasibility of the study.
Science without sense...double nonsense
Evidence Based Medicine pills
Science without sense...double nonsense
Evidence Based Medicine pills
Category Epidemiology
Some new come and some others go
Risk meassurement in an open cohort. In longitudinal studies with an open cohort, with incorporation and lost of participants, incidence rate is the measure to estimate risk.
About chalk and cheese
Frequency measures. The concepts of proportion, ratio and rate are reviewed, as well as the differences between the three frequency measures.
The necessity of chance
Randomization. Randomization favors that the characteristics of the participants are distributed homogeneously among the groups.
To err is human
Systematic error. Systematic error, also called bias, usually leads to an inaccurate estimate of the variable we are studying.