These results show that there was only a negligible (and, according to the χ 2 test, statistically insignificant) difference between the results in the cases when the tagger was both trained and tested on "old" corpus and both trained and tested on the "corrected" corpus.
the difference in the error rate when the tagger was once trained on the "old" and once on the "corrected" version, and then in both cases tested on the "corrected" version 10 , brought up a relative error improvement of 9,97%.