(2000)): The MCLE of (5) is easily calculated: P 0 should be set the empirical distribution of the training data.
the deleted interpolation parameters were estimated using heldout training data from section Joint SR Conditional SR PCFG Precision 0.666 0.633 0.700 Recall 0.650 0.639 0.657 table 2: Labelled precision and recall results for joint and conditional shift-reduce parsers, and for a PCFG.