an ‧ ec ‧ da ‧ ta /ˈænəkdeɪtə, ˈænɪkdeɪtə, -dɑːtə/ BrE AmE noun [uncountable]
information which is presented as if it is the result of serious research, but which is actually based on what someone thinks but cannot prove:
All this is just anecdata, when what we need now is some hard evidence of what UK firms are doing.