In order for a plan to work correctly, the control field must appear in all layers of the hierarchy, and the totals must align (block groups contain total of control field in block layer, tracts contain sum of block group values, etc).
In order for a plan to work correctly, the control field must appear in all layers of the hierarchy, and the totals must align (block groups contain total of control field in block layer, tracts contain sum of block group values, etc).