3. Effect on population figures of changes in standard metropolitan statistical area definitions.... 4. Population of major geographic areas... 577 ...579 Source references are given for each item of data included in this volume. For additional information on data presented, please consult the source publications, available in local libraries, or write to the agencies indicated in "Source Notes and Explanations." Users of this volume and of the Statistical Abstract of the United States and its other supplements (see inside back cover) are urged to make their data needs known for consideration in planning future editions. Suggestions and comments for improving coverage and presentation of data should be sent to the Director, U.S. Bureau of the Census, Washington, D.C. 20233. NA Data not enumerated, tabulated, or otherwise not available separately. S X Z Figure suppressed; does not meet publication standards for reasons other than that covered by symbol B, above. Figure not applicable because column heading and stub line make an entry impossible, absurd, or meaningless. Rounds to less than half the unit of measure shown. The following terms are also used throughout this publication: An average is a number or value that is used to represent the "typical value" of a group of numbers. It is regarded as a measure of "location" or "central tendency" of a group of numbers. The arithmetic mean is an average derived by summing the individual item values of a particular group and dividing the total by the number of items, e.g., average number of persons per household. It is often referred to simply as the "mean" or "average." The median of a group is the middle number of value when each item in the group is arranged according to size, e.g., median number of rooms per yearround housing unit. It generally has the same number of items above it and 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 persons. The birth rate is obtained by dividing the number of births for a given year by the population as of a specified date and multiplying the result by 1,000. Per capita is a rate per each individual, e.g., per capita direct local general expenditure. A percent is a rate per 100 units of an item, e.g., percent of total households with persons 65 years old and over. |