Marsh/Cook Expert Monster HD Analysis

Following up on my post about determining the distribution of monster HD in the moldvay basic text, I did the same thing for the Cook/Marsh Expert book. I found the analysis quite interesting. I remember thinking that there were very few 3HD monsters in the basic book - I had screwed that up with the expert book. There are very few ODD HD creatures in the expert book. Either Cook or Marsh (or both) had a thing with even numbers. They liked to make entries of monsters with 4, 8, 12HD creatures.


Here is the data:









It is also interesting to me that while the Moldvay progression seems very planned the Cook/Marsh distribution seems very haphazard. They both had roughly the same number of posts, I counted 102 in Moldvay and 101 in Cook/Marsh but I could be off by 1-2 in each case.