Commentary: 'The next trick is impossible.'.

@article{Perks2010CommentaryN,
  title={Commentary: 'The next trick is impossible.'.},
  author={Julie Perks},
  journal={International journal of epidemiology},
  year={2010},
  volume={39 5},
  pages={
          1153-5
        }
}
  • J. Perks
  • Published 1 October 2010
  • Psychology
  • International journal of epidemiology
(pp. 91–92). And from this, after some twist and turns and the not-always-friendly intervention of William Brown, we end up with what is generally known today as the Spearman–Brown reliability or prophesy formula. Spearman concludes his homily on the perils of systematic deviations with a discussion of how poor sample selection and the presence of irrelevant variables might cause other problems such as constricting, dilating or distorting correlations. Notable here is that Spearman gives a… 
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