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Behavioral science 1

the group being studied changes its behavior because they know they are being studied hawthorne effect
researcher's believe that a treatment is effective and it changes the outcome of the tx pygmalion effect
early detection is confused with increased survival. Seen with improved screening lead time bias
occurs when 2 closely associated factors "confound" each other confounding bias
subjects in different group are not treated the same procedure bias
the teacher pays special attention and spends mroe time with one gruop versus the other procedure bias
information is gathered at the wrong time i.e. using a survey to study a fatal disease late look bias
solution to late look bias stratify by severity
subjects are not representative of the general pupolation sampling bias
knowledge of presence of disorder alters recall by subjects recall bias
solution to recall bias confirmation
nonrandom assignment to study group selection bias
all sampling is from hospital pts selection bias
loss to follow up selection bias
ways to reduce bias 1. blind studes 2. placebo responses 3. crossover studies (each subjects acts as own control to limit counfounding bias) 4. randomization to limit selection bias and confounding bias
increase statistical power by? meta analysis
pools data and integrates results from several similar studies to reach a conclusion meta analysis
observer bias the investicgator's decision is affected by prior knowledge of exposure status
Created by: ilovemusic007