@mannofnope Have you tried it yourself to find out?

whereas entries below are quantities:

<maxNumOfSameColor value="10" /> <maxNum value="20" />

the frequency value actually is not, at least to my understanding up until now
if anything it's more a percentage value in which the model is used in the spawn cycle when called on via popgroups.ymt
so when set to 100 the game will try to load this model more frequently then set to 50

<frequency value="50" />