Hello, and welcome to module five.
Now that we've reviewed our epi study designs,
measures of disease frequency and association,
and some of the inferential statistics,
we're going to turn our attention
to threats to internal validity.
This is what we'll be spending pretty much
the rest of the course talking about.
If you remember back to epi one,
threats to internal validity include things like bias,
confounding, effect modification, or interaction,
and also random chance.
We'll start here in module five talking about bias.
Remember that bias is inherent in study designs.
It's not something that we can control or adjust for
in our analysis after the study is complete,
which means that we need to be really careful
in our study design to minimize bias
as much as we possibly can.
If you have questions on this material,
or need support in any way, please reach out.