Our Blog
All you wanted to know about Scientific Journals
How many open access journals in Ophthalmology and Optometry exist? What are the average Open-Access costs?
Sigdaan Team
How do you randomize in a Clinical Trial?
Let's imagine a study where you have two allocate subjects in two groups, is flipping a coin a valid randomization method?
Sigdaan Team
Scientific Publications in Ophthalmology and Optometry
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?
Sigdaan Team
Clinical Study Designs
What are the differences between a non-inferiority, superiority, super-superiority and equivalence study designs? How can we do sample size calculations?
Sigdaan Team
Basic Biostatistical Concepts
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.
Sigdaan Team
Competitors Comparison Table
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?
Sigdaan Team