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Selection Bias Nonrandom assignment to study groups(Berkson's Bias)
Recall Bias Knowledge of presence of disorder alters recall by subjects.
Sampling Bias Subjects are not representative relative to general population; therefore, results are not generalizable.
Late-Look Bias Information gathered at inappropriate time.
Procedure Bias Subjects in different groups are not treated the same.
Confounding Bias Occurs with 2 closely associated factors; the effect of 1 factor distorts or confuses the effect of the other.
Lead-time Bias Early detection confused with increased survival; seen with improved screening (natural history of disease is not changed, but early detection makes it seem as though survival increases).
Pygmalion effect Occurs when a researcher's belief in the efficacy of a treatment changes the outcome of that treatment.
Hawthorne effect Occurs when the group being studied changes its behavior owing to the knowledge of being studied.
Created by: davidallenf19



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