Hello, Carolina,
Your project is one I have been following among several researchers. There is much resistance in English Deptartments to these activities in the US. Have you used content analysis software such as VBPro? It has the capability of searching text strings such as start-and-stop coded speeches?
I used VBPro to study all the characters in Stoker's Dracula. Published in MLA journal Extrapolation.
Article Somebody Stole My Gal: Word Cluster Analysis of Exogamy Fear...
Cheers,
Gloria