O
0
5.
6.
In Strata B, C1 and C2, a sample of Estate blocks for each type of special
housing was selected. Fieldworkers then proceeded to list flats in these
estates in random order, starting with a randomly-selected floor in each
building, and with a randomly selected building in each estate complex.
These strata are therefore not geographical but represent these types of
housing wherever they may be located.
The pre-listing in Strata D to L took a slightly different form. Being highly urbanised areas, it was possible to make an initial selection of
a sample of city blocks, based on the most up-to-date maps of the urban
area of the Colony available through the Crown Lands and Survey Office..
Thus, in each different area, a sample of blocks was selected, and
fieldworkers listed all homes in the blocks.
CO
1
Finally, Strata M, N and 0 were treated differently, because of the rural
conditions prevailing in these areas. Primary Sampling Units (PSU's)
.were developed for each stratum in the following manner;
1.
By identifying those towns and/or small
cities (such as Tsuen Wan or Yuen Long)
in which standard "city-blocks" could
be located on a map, and by treating
-each block as a PSU,
iii
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