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LETTERS: Jeffrey K Aronson Too high a pedestal BMJ 2008; 336: 735 [Full text]

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What constitutes "random"?

Joseph More   (6 April 2008)

What constitutes "random"? 6 April 2008
Joseph More, Retired Waltham, MA 02453 Send response to journal: Re: What constitutes "random"?	The concept of “random” is less simple than it may appear at first. In practice it will boil down to a sampling process that, at the time of sampling, is independent of the outcome to be measured. It is quite likely that the sample will include different subsets with different responses to the treatment. Some may have a positive response, some a negative one, and some no response; these may cancel out, with the aggregate result showing no effect. Consequently, post study observations should ideally lead to further studies. The ethical question of conducting randomized studies is a difficult one indeed. On the other hand, in the 18th century it might have been considered unethical to randomize patients with septic fever into a “bleeding” group and an “observation only” group. Competing interests: None declared