Publisher's Synopsis
Excerpt from Census of Manufactures, 1937: Industry Classifications
The classification of reports for manufacturing establishments consists in the assignment of each to the particular industry to which it belongs in order to bring together, so far as practicable, data for all establishments engaged in the same industry or in kindred industries.
The specific industry to which a report is assigned is determined by the character of the product or class of products of chief value. This rule is occasionally disregarded, however, in order to avoid classifying an individual establishment in one industry at one census and in another at the next. To illustrate: In 1935 a certain establishment may have manufactured two general classes of products, one of which contributed 55 percent and the other 45 percent of its total value of products; but for 1937 these percentages might be reversed, the predominant class of products for 1935 becoming the secondary class for 1937. In such a case as this, in order to make the statistics for 1937 as nearly comparable as possible with those for preceding censuses, the establishment is classified in the same industry for 1937 as for 1935, unless it appears probable that the change -is permanent in character.
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