defensible lag structures and provided a lag structure that could be assumed until additional
research has been completed. See Chapter 5 of the PM RIA for more detail on assumed lag
structures forPM2.5-related premature mortality (http://www.epa.gov/ttn/ecas/regdata/RIAs/
Chapter%205--Benefits.pdf). Some example lag structures from the PM RIA are shown in
Figures 6-1 and 6-2 below. Currently, BenMAP does not have the capability to do this type of
discounting, so you must discount outside of BenMAP.
Note: Discounting is not necessary for ozone-related premature mortality because it occurs
within the analysis year.
7.1.3Overview of Pooling
For many of the health endpoints (e.g., mortality), BenMAP contains many different functions
from different studies that you could choose to include in your configuration. Combining data
from several comparable studies in order to analyze them together is often referred to as metaanalysis.
For a number of reasons, it is often impractical or impossible to combine the original
data sets. Combining theresults of studies provides a second-best way to synthesize
information. This is referred to as pooling.
BenMAP allows the pooling of incidence changes predicted by several studies for the same
pollutant-health endpoint group combination. It also allows the pooling of the corresponding
study-specific estimates of monetary benefits. See the appendix on Uncertainty & Pooling for
more detail on the pooling options available in BenMAP.
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