Does a Ph.D. improve your salary? In the field of Data Science, it does a tiny bit, but is hardly worth the investment of years of your life (if pay is primarily why you're pursuing the degree). On the other hand, learning a single cutting-edge analytics technique relates to a pay jump of $12,000. Here are my thoughts on using data to maximise your pay, based on a recent talk at Women in Machine Learning in Data Science.
This is a clip from a talk by Jon Krohn, untapt's Chief Data Scientist, to the New York chapter of Women in Machine Learning and Data Science, in February 2016. http://www.meetup.com/NYC-Women-in-Machine-Learning-Data-Science/events/228485984/