Table 3.

Patterns of coauthorship by type of coauthor and firm

Firm	SELF	Public	NIH	Hospital	University	Nonprofit	Private	Miscellaneous	Total
A	0.55	0.03	0.01	0.07	0.27	0.03	0.03	0.01	6,583
B	0.48	0.03	0.01	0.08	0.34	0.03	0.02	0.01	15,628
C	0.64	0.02	0.01	0.05	0.23	0.02	0.03	0.00	17,292
D	0.53	0.02	0.01	0.04	0.35	0.02	0.04	0.00	2,053
E	0.54	0.03	0.03	0.06	0.29	0.02	0.03	0.01	8,971
F	0.70	0.01	0.00	0.04	0.19	0.00	0.05	0.02	327
G	0.54	0.02	0.01	0.06	0.29	0.02	0.04	0.01	8,451
H	0.68	0.00	0.00	0.08	0.20	0.00	0.02	0.01	1,414
I	0.62	0.02	0.01	0.05	0.23	0.02	0.03	0.01	7,874
J	0.50	0.06	0.01	0.06	0.25	0.04	0.06	0.02	736
NIH	0.60	0.04	NA	0.04	0.25	0.03	0.02	0.01	170,014

Table entries are the fraction of instances each type of institution appears as an address of a coauthor on a paper published by each of the firms in the data set. The last column gives the number of instances of coauthorship for each firm. NA, not available.