I'd like to know if someone can recommend -- or knows of -- any computer assisted text analysis (CATA) programs capable of applying predefined concept dictionaries (lists of words and phrases representing a concept) to large datasets of tweets. I'm referring here to traditional, conceptual, content analysis (social science), not the bottom-up, data mining methods (computer science) primarily being used to analyze big data. An example of the kind of program I'm talking about is the freeware Yoshikoder (http://sourceforge.net/p/yoshikoder/wiki/Home/), but I'm unable to open a large (~ 3 GB) text file of tweets with it. - - - - - - - - - - - - - - David Voelker, Ph.D. Department of Communication Stanford University http://comm.stanford.edu/faculty/voelker/