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

By S. Nassir Ghaemi

Obtainable and clinically suitable, A Clinician's advisor to stats and Epidemiology in psychological future health describes statistical suggestions in undeniable English with minimum mathematical content material, making it ideal for the busy doctor. utilizing transparent language in favour of complicated terminology, barriers of statistical innovations 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 broad assurance of causation and the conceptual, philosophical and political components concerned, with forthright dialogue of the pharmaceutical industry's position in psychiatric study. through making a larger realizing of the area of study, this publication empowers health and wellbeing execs to make their very own judgments on which records 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

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The relevance of this discussion is that the relative effect sizes that are obtained in regression models are odds ratios, not risk ratios, and thus we need to remember that huge odds do not represent absolute probabilities of that size. The equation for regression models involves logarithms, and the conversion of logarithms to effect sizes produces odds ratios, not risk ratios. Multivariate regression Back to our equation. We have a predictor and an outcome; this is an association which is direct and uncorrected for any potential confounding variables.

05, and then conclude that there is “no difference” and thus no confounding effect. However, such use of p-values is generally thought to be inappropriate, as will be discussed further below, because such comparisons are usually not the primary purpose of the study (the study might be focused on antidepressant outcome, not age or gender differences between groups). In addition, such studies are underpowered to detect many clinical and demographic differences (that is they have an unacceptably high possibility of a false negative or type II error), and thus p-value comparisons are irrelevant.

In confounding bias, the exposure really has no relation to the outcome at all; it is only through the confounding factor that any relation exists. Another way of putting this is that in confounding bias, the confounding factor causes the outcome; the exposure does not cause the outcome at all. The confounding factor is not on the causal pathway of an exposure and outcome. In other words, it is not the case that the exposure causes the outcome through the mediation of the confounding factor; the confounding factor is not merely a mechanism whereby the exposure causes the outcome.

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