Recurring revenue is pretty much the holy grail for any business — it’s precisely why Apple has segued toward being almost as much a services company as it is a hardware company, with 20% of its ...

Indicators of the performance of different subsets of the variables are discussed and two criteria are defined. These criteria are used in stepwise selection-type algorithms to choose good subsets.

Randomization models, often termed "null" models, have been widely used since the 1970s in studies of species community and biogeographic patterns. More recently they have been used to test for nested ...