9

SWithheld because the estimate did not meet publication standards, either on the basis of the associated standard error of estimate or on the basis of a consistency review.

dwithheld to avoid disclosing figures for individual companies.

1The 1953 and 1952 "Average number of employees" is based on reported employment totals for the payroll 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 shipped less cost of materials, supplies, fuel, electric energy, and contract work.

3The 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: (i) 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.

Only selected sample error percentages are shown. Standard errors of the other general statistics estimates for Divisions, States, and industry groups are usually of the same general magnitude as the standard errors shown for employment and value added for 1952 and value added for 1953. The totals shown for 1953 and 1952 include employees separately reported at central administrative offices and auxiliary establishments.

"The totals shown for 1947 represent employment data only at operating manufacturing establishments. 6The Annual Survey figures for major group 24 are not strictly comparable with 1947 data. In 1947 only sawmills that produced more than 200,000 board feet of lumber were required to report the information shown in this table, whereas, for the Annual Surveys it was requested of all sawmills. It is estimated that all mills in the United States producing less than 200,000 board feet account for approximately 3 percent of total employment for major group 24. No estimate has been made of the importance of these small mills for individual States or Geographic

Divisions.

7The logging industry (Industry 2411) was excluded from the 1947 Census of Manufactures, but included in the Annual Surveys of Manufactures. Includes privately owned and/or operated establishments classified in Industry Group 19, "Ordnance and accessories." Government owned and operated establishments are excluded from the annual survey. Administrative office and auxiliary unit employment is based on the number of employees reported as of Mid-March 1953 under the Old-Age and Survivors Insurance program. The figures shown for 1952 represent administrative and auxiliary employment and payrolls for 1951, as BOASI did not tabulate these data for 1952. The approximated annual total payroll figure was derived by multiplying by 4 the first quarter taxable payroll figures listed in the joint Census-BOASI publication, County Business Patterns. The figures shown for administrative office and auxiliary units do not represent a separate industry but rather a balancing total for all manufacturing industries.

CHAPTER III: SHIPMENTS AND INVENTORIES

Table 1.--VALUE OF SHIPMENTS BY SELECTED CLASSES OF PRODUCTS, FOR THE UNITED STATES: 1953, 1952, 1951, AND 1947

(DOLLAR FIGURES IN THOUSANDS. A "class of products" is a homogeneous grouping of individual products within an industry. It is designated on the following table by a 5-digit code in column A, the first four digits indicating the industry (as defined by the Standard Industrial Classification System) and the fifth digit, the specific group of products. The value of shipments shown for a product class (5-digit) is on 8 "wherever made" basis, i.e., it represents total shipments of that class by all industries (the industry in which the product class is "primary" and other industries in which it is produced as a "secondary" item). The total value of shipments of all product classes belonging to an industry is also shown, on the same "wherever made" basis. It is designated by the 4-digit industry code followed by a dash (e.g., "2011-") if there are two or more product classes belonging to the industry; a 4-digit code followed by a zero indicates that there is only one product class belonging to the industry. This product class aggregate is not the same as the total industry value of shipments, as shown in Annual Survey tables. This latter total comprises all shipments by establishments classified in the specified industry, including their shipments of product classes primary to other industries but excluding shipments by establishments in other industries of product classes primary to the specified industry.

other

For 1947 a number of industries include some products which were not classified into a particular class of products but were tabulated and published as "not specified by kind." For subsequent years, however, all products of the industry were classified into one or more of the product classes. The amount of understatement for a particular class of product for 1947, due to the omission of the "not specified by kind," has been determined to be insignificant in most cases; where judged to be significant (more than 1 percent of the 4-digit product class aggregate) the value is shown separately. Wherever "not specified by kind" classes were used in 1947, the 4-digit product class aggregates for that year include the values of such classes.

The estimates for 1951 and 1952 are qualified by the sampling variations shown. For 1953, these variations were not calculated, but in general the error associated with each 1953 estimate will be somewhat larger than the standard error of the corresponding 1952 estimate. Where the 1953, 1952, or 1951 values are other than annual survey estimates, letter symbols appear in place of the sampling variations; the reference list of sources appearing at the end of the table is keyed to these letters. An estimate is not shown for a product class or an aggregate if it is inconsistent with related data, or the associated standard error of estimate exceeds (with few exceptions) 15 percent. The suppressed product class estimates are included, however, in the totals of product classes. Unpublished estimates, including those which can be derived by subtraction, are generally unreliable.)