Read e-book online A clinician's guide to statistics and epidemiology in mental PDF

By S. Nassir Ghaemi

ISBN-10: 0511579519

ISBN-13: 9780511579516

ISBN-10: 0511580932

ISBN-13: 9780511580932

ISBN-10: 052170958X

ISBN-13: 9780521709583

Obtainable and clinically proper, A Clinician's consultant to statistical data and Epidemiology in psychological healthiness describes statistical options in undeniable English with minimum mathematical content material, making it ideal for the busy doctor. utilizing transparent language in favour of advanced terminology, barriers of statistical innovations are emphasised, in addition to the significance of interpretation - instead of 'number-crunching' - in research. Uniquely for a textual content of this sort, there's vast assurance of causation and the conceptual, philosophical and political elements concerned, with forthright dialogue of the pharmaceutical industry's position in psychiatric examine. by means of making a larger realizing of the area of analysis, this publication empowers well-being pros to make their very own judgments on which data to think - and why.

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Extra info for A clinician's guide to statistics and epidemiology in mental health : measuring truth and uncertainty

Example text

Blinding (single – of the subject, double – of the subject and investigator) is used to minimize this bias. Many clinicians mistake blinding for randomization. It is not uncommon for authors to write about “blinded studies” without informing us whether the study was randomized or not. In practice, blinding always happens with randomization (it is impossible to have a double-blind but then non-randomly decide about treatments to be given). However, it does not work the other way around. One can randomize, and not blind a study (open randomized studies) and this can be legitimate.

Our equation would then become: P (Outcome) = β1 (Predictor1 ) + β2 (Predictor2 ) where Predictor1 is the experimental variable, and Predictor2 is the second variable, which might be a confounding factor, or which might itself be a second predictor of the outcome. This equation is a bivariate analysis. Sometimes researchers report bivariate analyses, comparing the experimental with the outcome, correcting for a single variable, one after the other, separately. This would be something like: P (Outcome) = β1 (Predictor1 ) + β2 (Predictor2 ) P (Outcome) = β1 (Predictor1 ) + β3 (Predictor3 ) P (Outcome) = β1 (Predictor1 ) + β4 (Predictor4 ) P (Outcome) = β1 (Predictor1 ) + β5 (Predictor5 ).

If a study has 51% males and 49% females, is that enough of a difference to be a confounding effect? What if it is 52% males, 48% females? 53% vs. 47%? 55% vs. 45%? Where is the cutoff where we should be concerned that randomization might have failed, that chance variation between groups on a variable might have occurred despite randomization? The ten percent solution Here is another part of statistics that is arbitrary: we say that a 10% difference between groups is the cutoff for a potential confounding effect.

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A clinician's guide to statistics and epidemiology in mental health : measuring truth and uncertainty by S. Nassir Ghaemi

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