2. The method according to claim 1 , wherein a further subset of the set of output states is formed by an output state of a single sensor of the chemical sensor array.
2. The method according to claim 1 , wherein a further subset of the set of output states is formed by an output state of a single sensor of the chemical sensor array. 3. The method according to claim 2 , wherein at least one of the first likelihood value or the further likelihood values is formed by a sum of likelihood values obtained for each subset of output states.