For more than 2 decades the popularity of text messages has been continuously increasing. At the same time the abuse of short message services (SMS) in terms of SMS-Spam is also increasing and leads to high costs and data security issues for mobile users as well as for service providers. In this...

Assuming a binomial distribution for word occurrence, we propose computing a standardized Z score to define the specific vocabulary of a subset compared to that of the entire corpus. This approach is applied to weight terms (character n-gram, word, stem, lemma or sequence of them) which...