N-gram

An n-gram in the context of keyboard layout analysis is a sequence of $n$ key presses.

In AKLDB, we use the first four orders of n-grams:

n	Name	Examples
1	Unigram	e, t, a
2	Bigram	th, he, in
3	Trigram	the, ing, and
4	Quadgram	tion, here, ment

Skipgrams

A skipgram is a bigram that is separated by one or more characters. In some earlier literature, it is called disjoint bigram, for example in the stat “disjoint same-finger bigram.”

On AKLDB, the term n-th order skipgram denotes a skipgram with $n$ characters in between. For example, the trigram abc contains the 1st order skipgram a_c (where _ is an empty placeholder, not a literal underspace).