Download PDF by S. Nassir Ghaemi: A Clinician's Guide to Statistics and Epidemiology in Mental

By S. Nassir Ghaemi

ISBN-10: 052170958X

ISBN-13: 9780521709583

Obtainable and clinically correct, A Clinician's consultant to statistical data and Epidemiology in psychological wellbeing and fitness describes statistical suggestions in undeniable English with minimum mathematical content material, making it excellent for the busy surgeon. utilizing transparent language in favour of complicated terminology, boundaries of statistical suggestions are emphasised, in addition to the significance of interpretation - in place of 'number-crunching' - in research. Uniquely for a textual content of this sort, there's wide insurance of causation and the conceptual, philosophical and political elements concerned, with forthright dialogue of the pharmaceutical industry's function in psychiatric learn. by means of making a better realizing of the area of analysis, this ebook empowers health and wellbeing execs to make their very own judgments on which statistics to think - and why.

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Additional info for A Clinician's Guide to Statistics and Epidemiology in Mental Health: Measuring Truth and Uncertainty

Example text

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. Thus, since 10% of 50 is 5%, we would be 25 Section 2: Bias concerned about a gender difference that is something like 55% vs.

Both confounding bias and EM occur a lot, and they need to be assessed in statistical analyses. Measurement bias The other major type of bias, less important than confounding, is measurement bias. Here the issue is whether the investigator or the subject measures, or assesses, the outcome validly. The basic idea is that in subjective outcomes (such as pain), the subject or investigator might be biased in favor of what is being studied. In more objective outcomes (such as mortality), this bias will be less likely.

Counting I previously mentioned that medical statistics was founded on the groundbreaking study of Pierre Louis, in Paris of the 1840s, when he counted about 70 patients and showed that those with pneumonia who received bleeding died sooner than those who did not. Some basic facts – such as the fallacy of bleeding, or the benefits of penicillin – can be established easily enough by just counting some patients. But most medical effects are not as huge as the harm of bleeding or the efficacy of penicillin.

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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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