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Hi everyone and welcome to module six.

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In this module, we'll
continue our discussion

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of threats to internal validity.

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We're going to start
talking about confounding.

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This is the first

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of three modules in which
we'll discuss confounding.

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You might remember back

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to our discussion of
confounding and epidemiology one

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where we talked about
how we're able to control

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or adjust for confounding in
the analysis phase of a study.

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In EPI one, we talked about adjusting

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and controlling for confounding
in terms of stratification.

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However, there are more advanced methods

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involving linear regression

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that we'll talk about
in the next few modules.

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Make sure you're feeling
really comfortable

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and solid with the
information in this module

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because we're going to keep building

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on it for the next few modules.

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Have a good week and take care.