[R] Single plot multiple levels in x?

[Richard Yanicky]

Plotting with 2 x axis?


One axis inside another, for example salary within state,




1-50     |     50 – 100 |  100+   |   1- 50 | 50 -100 | 100+ | …  repeated bins for salary
               AL                           !               AR                     ……  more states


The values are all stored with a single data frame. I have tried different things with the axis function and done many searches for plotting. Can’t find a direct reference 


Thanks.

Richard