Computing Population Percentages per County

Discussion created by bowmanlucas on Nov 1, 2011
I have per county population data for whites and nonwhites from the 1830 census on NHGIS website (great website!). I want to display what percent of each county is either white or nonwhite.I have tried using raster calculator to divide each white/nonwhite population into the total population per county (raster) and multiplying by 100. However, the new raster I get is only 2 values. Ive also tried adding a field onto the shapefile I joined my excel file too and doing the same equation--no luck. I have done this before in Arc9.3, but obviously I have pasted it far beyond my memory. Any help? Thanks.