Sex, drugs, and violence
Table 2: PLDA model classification results for aggregated rating levels, threshold=5%
['[EMPTY]', 'Bg-topics N-topics', '0 1', '5', '10', '1', '5', '10', '5 1', '5', '10', '10 1', '5', '10']
(there was no significant effect of moving this threshold from 0.1% to 10%). Recall is generally in-line with previous work, albeit on a more challenging task of topic modelling, rather than keyword spotting. Across all parameters, precision is <52%, as labels for inappropriateness tend to be over-applied. This is especially true for the ‘drugs’ category, for which there are the fewest examples. Although not shown, the distribution of error rates over the individual rating levels indicates that errors arise predominantly from level 4 (i.e., highly inappropriate). Since this analysis treats the labels as nominal, interchangeable classes rather than lying on a continuum, we also perform a regression analysis in the next section.