Although I am a long-time user of Wikipedia, I am relatively new to contributing, having only joined the team in October 2013. While I do make the occasional random edit, my main focus thus far has been on expanding and improving articles related to regional economics.
This was originally a fairly brief article, and I have some experience performing shift-share analyses, so I decided to help expand the article. I added to the coverage of the traditional analysis model, and added sections for three more models, along with several more sources.
This article was originally tagged with multiple issues, including concerns about its readability and primary sources. I am in the process of trying to address these concerns, and hopefully expand the article along the way.