AND SELECTED INDUSTRIES: 1951, 1950, 1949 AND 1947--Continued

*NOTE: The Census Bureau classification for all of the textile industries is in agreement with the Standard Industrial Classification (S.I.C.) system at the 4-digit level but regroups certain of these industries by fiber consumed at the 3-digit level. The S.I.C. group 222 differs from the Census group 222 only in that the former includes Census number 2212, Yarn mills, wool, except carpet; similarly S.I.C group 223 includes Census number 2213, Woolen and worsted fabrics. Following are the 3-digit figures for 1951 and 1947 regrouped according to the 1945 edition the Standard Industrial Classification Manual:

of

The 1951, 1950, and 1949 "average number of employees" is based on reported employment totals for the pay roll periods ended nearest the 15th of March, May, August and November. For 1947, an average based on the mid-month employment for 12 months was used. 2Value of products less cost of materials, supplies, fuel, electric energy, and contract work.

"The percentage standard errors shown in this column indicate the differences that can be expected between the estimates and comparable complete canvass totals, because of sampling fluctuations. The estimates will differ from the complete totals by less than:

(1) The percentage shown: approximately 2 times out of 3.
(ii) Twice the percentage shown: approximately 19 times out of 20.
(iii) Three times the percentage shown: almost always.

To maintain comparability with 1951 and 1949 employment estimates, the "all industries" and 2-digit employment totals for 1950 have been adjusted to include employment at plants not in production at any time during the year. Employment at these plants is estimated at 82,000 during 1950. The 3-digit and 4-digit estimates have not been similarly adjusted. In addition, the 1950 estimates for a few industries have been revised for other reasons and, therefore, differ from previously published data.

"The totals shown for 1947 do not include employment at central administrative offices and auxiliary units.

"The logging industry (Industry 2411) was excluded for the 1947 Census of Manufactures, but included in the Annual Surveys of Manufactures. There was also some undercoverage in the 1950 and 1949 sample for this major industry group, especially in Industry 2411. The sample design for the 1951 Annual Survey of Manufactures was revised to correct the undercoverage in this industry.

Includes privately owned and or operated establishments classified in Industry Group 19, "Ordnance and accessories." operated establishments are excluded from the annual survey.

Government owned and

8 Administrative office and auxiliary unit employment is based on the number of employees reported as of Mid-March under the Old-Age and Survivors Insurance program. The administrative and auxiliary employment and pay roll figures for 1950 were also used for 1951, as 1951 OASI program data were not available for this publication. The approximated annual total pay roll figure shown in column B was derived by multiplying by 4 the first quarter taxable pay roll figures listed in the joint Census-BOASI publication, County Business Patterns, First quarter 1950. The figures shown for administrative office and auxiliary units do not represent a separate industry but rather a balancing total for all manufacturing industries. The employment figures are distributed by 2 digit industry groups in the table in the introductory text.

than

Includes data for Sausage casings (Industry 2014). 10Data unavailable because certain large manufacturers could not provide accurate information on cost of materials or value of products shipped. The major industry group (2-digit) total, however, which includes an estimate for this industry is not significantly affected. 11Data for 1951, 1950, and 1949 for Industry 2421 are not strictly comparable with 1947. In 1947 sawmills that produced less 200,000 board feet of lumber were required to report only lumber production and lumber stocks; whereas in 1951, 1950 and 1949 all items covered by the survey were collected and tabulated for this group of establishments. It is estimated that the mills producing less than 200,000 board feet account for approximately 5 percent of total employment in Industry 2421. 12 Includes data for Shingle mills (Industry 2423). 13Data for 1951 not comparable with prior years.

For 1947 through 1950 establishments engaged in the production of wood or metal storm-sash, and wood-or-metal combination-screen-and-storm-sash and doors, were classified in Industry 2561, (Window and door screens). In 1951, they are classified in Industry 2431, (Millwork plants), if the products are of wood; in Industry 3442 (Metal doors, sash and trim), if the products are

of metal.

14Includes data for Building-paper and Building-board mills (Industry 2613).

15The 1951, 1950, and 1949 data for Industries 3811 (Scientific instruments), 3821 (Mechanical measuring instruments), 3831 (Optical instruments), 3861 (Photographic equipment) are not strictly comparable with data shown for 1947. This is due to the misclassification in 1947 of establishments and to the change in plant definition after 1947 for some establishments. On a comparable basis in terms of value added by manufacture, it is estimated that the 1947 figures for Industry 3831 should be approximately 50 percent greater and about 5 percent less for Industry 3811.