The new package obsSens is now on the CRAN mirrors. This package has tools for
doing senstitivity analysis for observational studies.
The common criticism of observational studies is that there is the possibility
of an unmeasured variable that is related to both the response and the predictor
of interst that could explain the observed relationship. The sensitivity
analysis is a "What If?" game where you specify potential
relationships between the unmeasured variable and the response and predictor
variable and see how that affects the relationship between predictor and
response.
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