Is a BIBD even possible?
We saw in the video that it's possible a BIBD doesn't exist at all. It's useful to calculate the lambda
beforehand, and if the result isn't an integer, there isn't a possible BIBD.
Don't bust out the pen and paper yet: the lambda()
function has been defined for you. It takes as input t
= number of treatments, k
= number of treatments per block, and r
= number of repetitions. It then calculates lambda
according to this formula:
r(k - 1) / (t - 1)
.
Try the different combinations of t
, k
, and r
using lambda()
in your console, and choose the answer which does NOT have a BIBD.
This exercise is part of the course
Experimental Design in R
Hands-on interactive exercise
Turn theory into action with one of our interactive exercises
