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HOURS OF WORK IN MANUFACTURING, CONTRACT CONSTRUCTION,

AND TRADE

1953 to date

(Seasonally adjusted)

60

50

1953

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HOURS OF WORK IN MANUFACTURING, CONTRACT CONSTRUCTION,

AND TRADE

1953 to date
(Seasonally adjusted)

1953

60

50

1953

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Chart 9.

PERCENT

12

10

8

6

Chart 10.

UNEMPLOYMENT RATES BY MAJOR OCCUPATION GROUPS

1957 to date

(Seasonally adjusted)

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Labor Force Series

In accordance with its regular practice at the beginning of each year, the Bureau of Labor Statistics has recomputed and revised the seasonal adjustment factors for unemployment and other labor force series. The revisions incorporate data through December 1967. The revised seasonal adjustment factors shown on page 13 and the seasonally adjusted series on pages 15-22 replace those published in the February 1967 Employment and Earnings and Monthly Report on the Labor Force, which were based on data through December 1966. The incorporation of 1967 data and the recomputation of the seasonally adjusted data do not alter the unemployment rate of all civilian workers from those published last year by more than 0.1 percentage point for any month in the entire series.

Conceptual Changes

In January 1967, the definitions used in the measurement of employment and unemployment were modified and improved in line with the recommendations of the President's Committee to Appraise Employment and Unemployment Statistics. These improvements have clarified and sharpened concepts and increased the accuracy of the statistics. In terms of comparability of 1967 with earlier data, however, they have tended to: (1) increase the number of workers working 1-34 hours and lower the number working 35 hours or more; (2) alter the distribution of unemployment by sex; (3) increase the number of workers on economic part time; (4) reduce the number of workers unemployed 15 weeks or longer; and (5) alter the seasonal pattern of teenage unemployment. 1/

1/A detailed discussion of the conceptual changes and their affect on the various series may be found in the February 1967 Employment and Earnings and Monthly Report on the Labor Force and in Concepts and Methods Used in Manpower Statistics from the Current Population Survey (BLS Report No. 313, June 1967). Reprint articles are available upon request.

The change in the seasonal pattern for teenagers results from the addition of the "current availability" test for teenage jobseekers because, during the spring, persons in school looking for summer jobs are no longer counted as unemployed. In 1967, a special procedure was used to develop appropriate seasonal factors for unemployed 16 to 19 year-olds. This procedure was improved for use in 1968 and extended to cover the factors for 16 and 17 year-olds, 18 and 19 year-olds, and 16 to 19 year-olds by color, and the short-term unemployed (less than 5 weeks).

An evaluation and comparison of data based on the new definitions with historical data based on the old definitions did not clearly indicate any appreciable changes in the seasonal pattern for other series. Nonetheless, review and evaluation will continue in the coming year. If this research reveals a need for further special seasonal adjustment procedures, revised factors and data will be developed and published later this year.

Historical Comparability

Beginning in January 1967, all data reflect the definitional changes adopted at that time and are seasonally adjusted using the factors published in this issue. However, as indicated earlier, data for some labor force series in 1967 are not exactly comparable with those prior to 1967. (See footnote 1.)

Beginning in 1960, the data include Alaska and Hawaii; this should be taken into account in making comparisons with previous years. The inclusion of Alaska and Hawaii resulted in an increase of about 300,000 in the labor force, four-fifths of this in nonagricultural employment. The levels of other labor force categories were not appreciably changed.

Beginning in 1953, population data from the 1950 Census were introduced into the estimating procedure, affecting the comparability of the labor force figures with pre

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