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stratum in proportion to the number of persons engaged in the strata
rather than in proportion to the number of establishments in the stratum.
Since there are fewer large companies, the latter method would exclude
all companies with more than 100 employees. The sample frame was
obtained from the Census & Statistics Department with the assistance of
the Employment Section and the Wholesale and Retail Section.
In addition to the numbers of establishments sampled in the strata
tabulated above, an additional 10% of the establishments were taken
from each stratum to replace establishments found to have closed down,
to have faulty addresses or no employees. A total of 560 establishments
were sampled.
Street
The sample of employees was obtained from the frame of domestic
living quarters kept by the Census and Statistics Department.
blocks were sampled with a probability of selection proportional to the
number of living quarters in the street block. In the second stage of
sampling, a simple random sample of 13 living quarters per street block
was selected. In the third stage of sampling, all employed persons
within the above definition who were dwelling in the living quarter were
selected for interview. A total of 2,089 employed persons were
interviewed. This sample of employees belonged to a large spectrum of
occupations and industries and information on the industrial or
occupational variations can be obtained by post-stratification.