THE NATIONALIZATION OF STATE INTEREST GROUP SYSTEM DENSITY AND DIVERSITY

The authors replicate and extend their previous cross-sectional findin gs on state interest group system density and diversity by demonstrati ng that their models are useful in understanding change in diversity a nd density over time. In addition to developing and testing change sco re analogs of the models, they incorporate into each a homeostatic cha nge process. The results not only support the core of the models but s uggest that the unusually rapid growth in the number of groups over th is period rendered state interest group systems far more homogeneous i n terms of their responsiveness to the variables identified in the pre vious models.