Vord frequency histogram as an indicator of the text category

[ReneZ]

Well, all transcriptions are going to have errors, and the best we can hope is that they're not consistent enough to bias the statistics. This depends a lot on the exact type of statistics one is making.
Word frequency counts (as in this particular case) should not be affected so much by the alphabet used as, for example, character entropy statistics will be.
In the present case (word counts), handling of apparent word spaces is much more important, and this is a real issue.