There seems to be a balance between recall and precision. The addition of heuristics in the parsing lowers the recall but makes the precision higher as the use of heuristic rules discards both erroneous and correct analyses. This connection between recall and precision seems to be quite constant throughout all text categories. There seems to be no connection between sentence length and the performance of the parser in terms of recall and precision. Text types with longer average sentence length, however, have both lower recall and precision than text types with shorter average sentence length.
Morphological ambiguities seem to feed syntactic ambiguity.
This is not at all surprising since every reading of a single syntactic unit will receive at least one syntactic label. Overgeneration of morphological readings feeds overgeneration of syntactic analyses since every morphological reading more than necessary generates at least one syntactic tag more than necessary. The overgeneration of syntactic tags does, however, not always affect recall and precision in a negative way. The overgeneration of syntactic tags seems to be the reason why the connection between recall and morphological overgeneration seems to be reversed. If a word has many syntactic tags attached to it, the chance of finding the correct one among them is greater than if only one syntactic tag is present.