Randomization w/o allocation concealment doesn't do anything for risk of selection bias (though the former is necessary for the latter), so why present them separately like this?pic.twitter.com/TCGCWOlund
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
I'm not sure I understand. In this scenario, you'd roll dice to determine allocation. No one knows before the dice roll which group a person is going into, therefore allocation is concealed insofar as selection is concerned, no?
Definitely a risk of selection bias, but it's due to the poor randomization, not the allocation concealment
Allocation concealment is about what happens after randomization. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2596474/ …pic.twitter.com/fFKkuvLGjT
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.