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. 2002 Apr;37(2):457–482. doi: 10.1111/1475-6773.032

Table 2.

Various Competition Indices Under a Simplified Condition

Number of competitors to hospital i (n) Direct competition i receives from j (Cij) Total competition i receives (Ci) Direct competition j receives from i (Cji) Direct competition j receives from j (Cjj) Total competition j receives (Cj) Herfindahl Index (HHI) 1-HHI
1 1.0000 1.0000 0.4286 0.0000 0.4286 0.5800 0.4200
2 1.0000 2.0000 0.8571 1.0000 1.8571 0.3350 0.6650
3 0.7778 2.3333 1.0000 1.0000 3.0000 0.2533 0.7467
4 0.5833 2.3333 1.0000 1.0000 4.0000 0.2125 0.7875
5 0.4667 2.3333 1.0000 1.0000 5.0000 0.1880 0.8120
10 0.2333 2.3333 1.0000 1.0000 10.0000 0.1390 0.8610
15 0.1556 2.3333 1.0000 1.0000 15.0000 0.1227 0.8773
20 0.1167 2.3333 1.0000 1.0000 20.0000 0.1145 0.8855