This is the Lorenz curve. Adjust the scales so that they range between 0 and 100. Print this graph out. Examine the area between the curve and the diagonal. Using this formula, compute this measure based on uncumulated percentages.
Location quotients measure the extent to which different areas depart from some norm.
Then, export the file with location quotients into ArcView, link it to the Michigan boundaries file, and create a choropleth map showing location quotients.