Intuitively speaking, the TPS of a given dependency type in a given corpus indicates the average occurrence of that dependency type in a sentence in the same corpus.
the raw texts without tags (downloaded collectively as a data-only file from the website of ANC: http://www.anc.org/MASC/Download.html) were parsed through the Stanford Lexicalized Parser v.3.7.1 after some parts of the texts (titles, headers, dates, unconventional punctuations, etc.)