Started out with time series analysis by using packages such as eViews, building time series predictive models, estimating interactions. Mainly in macroeconomics.
Then I picked up R, absolutely loved it. Learned it by myself, some from open universities, some from documentation, some from stackoverflow. And now I earn my living by doing data analysis with R in telecom company.
Q&A for professional and enthusiast programmers
Q&A for astronomers and astrophysicists
Q&A for cartographers, geographers and GIS professionals
Q&A for computer enthusiasts and power users
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization