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Hi everyone,

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and welcome to the fourth
module of Epidemiology 2.

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This module focuses on
measures of association,

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so that's things like risk
ratios, attributable risk,

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and odds ratios.

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We first review what we did in Epi 1,

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looking at these measures

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and when they are appropriate to use

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and then we'll look more deeply

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into the mathematical
development of these measures

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and also the relationship
between the measures,

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particularly the relationship
between risk and odds.

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This will be very important
for us as we go forward.

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If these measures have been
tricky for you in the past

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or if it's been a while

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since you've really thought about them,

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I encourage you to go back
to your Epi 1 textbook

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and notes to refresh your memory

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before diving into this week's material.

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If I can help in any way with this

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please don't hesitate to let me know.

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Have a good week and take care.