Lecture 2a

Question 1

Which are the 3 elements of random design that can guide you?

Answer 1

Access, Timing and Encouragement.

Question 2

What is meant by Stratification?

Answer 2

Instead of adding a control variable, we could divide the group into two groups –> Randomize within each group to get a control and treatment group in each new group. THIS IS CALLED stratification.

Or

“We divide the group of eligible subjects into a few strata and then apply simple randomization”