Worm data
			
These data record the occurence of a human parasitic worm infection 
in residents of a rural community in China. 

The variables are:
	Age:       age of the resident
	Infection: presence (1) or absence (0) of infection
	Sex:       male (1) or female (2)
	
Source: The background to the data, and an analysis, are described
	by Weidong et al. (1996), Ascaris, people and pigs in a rural
	community of Jiangxi province, China, Parasitology 113, 545-57.