# Which type of regression analysis should I use for consumption pattern data?

I conducted a survey asking people of various income groups about their annual expenditure under various consumption brackets such as food, clothing, housing etc. I then calculated the amount spent by people of different income brackets in these categories as a percentage of their total income. Now, to plot this data and find the best fit line which type of regression analysis should I use. Also are there some other good statistical tools that I can use for exploiting this data?