Another long response — sorry. I know I tend to annoy some people.
I’m in the US, and things work a bit differently in the UK. But here, a graduate student will find the same kinds of mandates about focusing and narrowing things down to a more well-defined course of study from one’s graduate committee in gaining approval on a thesis or dissertation. It’s just the reality of many research-based graduate programs where students are doing more self-directed exploration than sitting in a classroom memorizing things.
The whole point, from my perspective, is to force the student to dig deep and narrow, challenge his or her assumptions, turn over every stone and explore all sides of the issue in ways that are specific enough to be original, innovative, defensible and genuinely meaningful in ways that push the boundaries of knowledge and understanding. At the completion of the program, a graduate student is expected to be a foremost authority on his or her specific subject and to convincingly argue and successfully defend every contention reached in the thesis and back it up with research.
For now, you might want to think of your decision as results of exploring a hierarchy of sorts. First, you might decide what interests you about data visualization. Then, depending on your answer, break that down into possibilities, then pick one of those possibilities, ask yourself questions, then do it again and again until you’ve narrowed it down enough to not be too broad. While working through this series of increasingly specific questions to yourself, make your decisions based on a combination of your personal interests and their potential for research and drawing meaningful and original conclusions.
For example, just off the top of my head…
- I'm interested in business applications
- I'm interested in theoretical businesses uses down the road?
- I'm interested in and concerned with how social media and various tracking technologies accumulate personal data.
- I'm interested in the ethical consideration associated with future business uses of data mining personal information to manipulate behavior.
- I'm also interested in how this data can be used to improve people's lives.
- I'm especially interested and want to research navigating the gap between uses of data visualization for good and arguably manipulative or nefarious purposes
I’m not at all suggesting that this is a logical sequence of choices for you. Maybe you really want to focus on graphics or statistics or methodologies or whatever. It’s really up to you and your graduate program.
I’m just suggesting that it might help to approach making your decision in a sequential way with each successive question being a range of possibilites that stem from your answer to your previous question. If you’re going to spend two years deeply immersed in graduate research, it better be something you find interesting and suitable for research and forming logic-based opinions that can be backed by that research.
By the way, have you ever read any of Edward Tufte’s books? They’re largely pre-digital and deal with the display of, primarily, analog data, but they’re still great books for anyone interested in data visualization. Specifically, the book titled, The Visual Display of Quantitative Information, was nothing short of a total game changer when it was released in the early '80s.
A few weeks ago, I also ran across this doctoral dissertation on the subject that might stimulate some thoughts: http://benfry.com/phd/dissertation/