The fragility of the EmPress
Fragility index. Fragility index describes the minimum number of participants whose status has to change for p to go from being statistically significant to not being so.
Science without sense...double nonsense
Evidence Based Medicine pills
Science without sense...double nonsense
Evidence Based Medicine pills
Read MoreThe fragility of the EmPress
All roads lead to Rome
Comparison of proportions. We review the methods for comparison of proportions: chi-square, Fisher’s exact test and approximation to a normal. This expression has its origin in the crazy habit that came to Romans for making roads connecting the capital of the…
Brown or blond, all bald
Comparisson of variables. We describe the statistical tests that should be used for comparisson of variables of different kinds.
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.