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Stressor-response analysis is particularly challenging when you
are dealing with multiple stressors. These issues first arise during
planning; there are many decisions assessors and managers need to
make up-front about how multiple stressors will be assessed.
Multiple regression analysis can be difficult to interpret if the
stressors are not independent. How you approach multiple stressors
depends on the feasibility of measuring them and on whether an objective
of the assessment is to project different stressor combinations.
You can extract independent explanatory variables formed from linear
combinations of the original variables using principal components
analysis.
Click the reflection icon below for a guided consideration of how
you decide what kind of information to collect, based on how you
and the risk manager have decided to address some of the issues
involved in risk assessment.
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What Information Do
You Need? |
Now that you've explored the possibilities for analyzing the stressor-response
relationship, let's move on to the next step in ecological response
analysis: establishing causality.
Relevant
guidelines section(s): 4.2.1.1 and 4.3.1.1.
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