Abstract
In studying the frequency of respiratory conditions among California populations, we are interested in making two different types of comparisons with studies done in other geographic locations. The first type of comparison is one in which the rates for some unequivocally defined condition are compared among presumably comparable populations living in two or more different areas. In the ideal case, if the criteria and methods are identical in the two areas and the populations differ in no important unaccounted-for attributes, any statistically significant differences in the observed rates must reflect some influence of the location in which the populations live and work. In this idealized case one needs to look for attributes
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