The median of a group is the middle number or value when each item in the group is arranged according to size, e.g., median household income. It generally has the same number of items above it or below it. A rate is a quantity or amount of an item measured in relation to a number of units of another item, e.g., the number of births per 1,000 resident population. The birth rate is obtained by dividing the number of births for a given year by the resident population as of a specified date and multiplying the result by 1,000. Per capita is a rate per individual, e.g., per capita taxes.
Sampling methods Needs the source of data for sampling methods.
Rounding of the data may be the reason for these occurrences, or the total may include values that could not be allocated to the lower geographic levels shown. Other examples are generally footnoted in the tables or explained in the text. The Bureau of the Census can not accept the responsibility for the accuracy or limitations of the data presented in this publication other than for those it collects. The responsibility for selection of the material and for proper presentation, however, rests with the Bureau. CTRE is an Iowa State University center.