How many open access journals in Ophthalmology and Optometry exist? What are the average Open-Access costs?
Let's imagine a study where you have two allocate subjects in two groups, is flipping a coin a valid randomization method?
How many papers are published every month in Ophthalmology and Optometry? How many sources exist to track down publications? How to quickly find references for my manuscript or sample size calculations?
What are the differences between a non-inferiority, superiority, super-superiority and equivalence study designs? How can we do sample size calculations?
Types of variables, what is a skewed distribution? how can we compute the Confidence Interval or the Standard Error? Which post-hoc test we should use? and more.
A comparison between Sigdaan and other alternatives. How many options exists with free plans? do all of them allow sample size calculation as well as statistical analysis and randomization?