Brown or blond, all bald
Comparisson of variables. We describe the statistical tests that should be used for comparisson of variables of different kinds.
Science without sense...double nonsense
Evidence Based Medicine pills
Science without sense...double nonsense
Evidence Based Medicine pills
Read MoreBrown or blond, all bald
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.
Cheating Gauss
Transforming data. Sometimes our data set will not follow a normal distribution. We can try transforming data to change this situation.
When the zeroes of p are important
Bonferroni’s correction. By making multiple comparisons, the risk of Type I error increases proportionally. This can be avoided with the Bonferroni’s correction.