PALESTINIAN SOCIETY - Fafo

2 Gaza Strip Sample Design
The design adopted has been a stratified, 4-5 stages procedure
involving simple random sampling at each stage. Information about
the survey population was initially quite scarce. It seerned that the
reliable, basic statisties necessary for proper sampling would have to
be produced during the process of sampling itself. Fortunately, by the
concIusion of the planning process some of the information most
needed for sample allocation, emerged in the form of unpublished
material provided by the Gaza statistical office. TIms population
figures which otherwise had to be estimated by enumeration of some
100 neighbourhoods, became accessible.
Relevant sampling frarnes (directory, register of the household
population) for selection ofhouseholds were not available. The final
stages of the sampling procedure therefore were carried out through
"on-the-spot sampling", in vol ving map preparations prior to the data
collection stage.
Sampling DetaiIs
The complete sample design comprises the following steps:
1 Definition/construction of Primary Sampling Units (PSUs). The
PSUs are areas or localities which are easily identified on maps. In
most cases a PSU coincides with the administrative concept of a
"Iocality", for which more detailed maps were available.
2 The PSUs were stratified by type oflocality (see table A.4). Strata
are labeled s (= 1, ... ,8), and PSUs are labeled k (= 1,2, ... ). The total
number ofPSUs in stratum s is denoted K(s). We wiII use the notation
"PSU (s,k)" to denote the k'th PSU of the s'th stratum.
3 A 1 st stage sample of PS Us to be surveyed were selected by simple
random sampling within each stratum. The sample number of PSU s
in stratum s isdenoted k(s). The 1 st stage samplingfractionforthe s'th
stratum is
(2.1) P l (s, k) =
k (s)
K (s)
which in this case (simple random sampling) is the incIusion probabil
it Y of PSU (s,k) as well. (2. 1) implies that all PSUs of the same
stratum have an equal chance of being incIuded in the sample.
It may be seen from table A.4 that stratum 8, "Outside localities",
was not incIuded in the sample. The character of these areas is
somewhat different from that of other localities, as there is no
municipal authority. On strict scientific groulJ.ds it could be argued
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