Some Buddhist writers seem to imply that they can apply a screen or test, linguistic or otherwise, to the Pali Canon and thus separate the original teachings of the Buddha from its "later" degenerations, and are thus able to describe "original Buddhism."
However, any application of this "method" seems to degenerate almost immediately into an ideological argument based on implicit assumptions of what the Buddha's teaching was like or naive inferences that because a text appears to be later, that automatically disqualifies it from consideration (in fact, later texts can incorporate or revise older traditions, elaborate older doctrines, consist of valid inferences, or even consist of valid original insights based on the original set of insights and thus be valid in their own right).
Yet despite these claims one finds only vague generalizations (e.g., Pande) or outright ideology. If such an algorithm existed, it should be possible to create a revised textus receptus and I have not seen this. A.K. Warder, a Pali scholar and a linguist, says nothing about this in Indian Buddhism, although he does imply that the Digha Nikaya is the oldest and therefore most authentic part of the Pali Canon.
Does anybody know of an in depth and articulate description of such a linguistic algorithm or method that is free of ideological bias?