Since I’m using Limitless at the moment I figured I would share a couple of the tools I found today that are helpful for scholarly types. I had been looking for stuff like this for some time, but it is difficult to find good NLP/textual analysis tools out there that are GUI driven and non web based. I prefer not to expose my data to the entire internet.
First useful tool for comparative literary analysis is called WordCruncher.
Although they have a web based version of the tools, I have used it instead for local analysis. You can create your own corpuses by adding text files to a list, and define sections of those text files to search. There are several tutorials available on YouTube for the program.
The most helpful functionality I’ve found is the Phrase Compare report. This allows you to take one or more texts, and compare n-grams within the texts for frequency. These can be arbitrary length n-grams, so for example with n=5 within the King James Bibles as a corpus, it will find phrases such as “love the lord thy god”, “love the lord your god”, “and it came to pass”, “the tabernacle of the congregation”, and so on.
You can download a number of free or paid pre-prepared corpuses from their store for different classical literature, and compare against your own local texts. So this can be helpful for university professors for example in detecting plagiarism, or seeing borrowed phrases that persist across centuries.
There is also a program called AntConc for specially prepared texts which allows you to perform more advanced types of textual analysis:
https://www.laurenceanthony.net/software/antconc/
If you use these tools in conjunction, you can do a lot of very fancy literary analysis, which I am just getting started with. You can copy and paste the n-gram frequency analysis into a program like Excel or Libre-Office for exporting to disk for further analysis, or to create graphs comparing the frequency of words in different texts for pasting into your thesis. This makes it easier to do intertextual analysis without wasting your time setting up a program to get the same results.
I highly recommend these programs, especially WordCruncher (which is free, as is AntConc). Intertextual analysis tools are becoming important nowadays in order to generate data to support conclusions based on novel investigations of old classical texts.