We define: • λ(T ), σ(T ) and (T ) as the subsets of T that respectively contain all tweets in language λ, script σ and sentiment .
• The preference towards a language-script pair λσ for expressing a type of sentiment is given by the probability pr(λσ), which defines the prior probability of choosing λσ for a tweet is dependent on a large 2 Tweets in mixed script are rare and hence we do not include a symbol for it, though the framework does not preclude such possibilities.