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In order to examine the possible design effect of our study, we stratified our analysis according to the sampling region (Athens or Thessaloniki) and to the sampling cluster units (university or social insurance dental clinics).
No significant differences in our results were noted when the effect of the sampling region of the study (Athens or Thessaloniki) or the sampling cluster units (university or social insurance dental clinics) was accounted for (Table 6).
Therefore, we did not consider other possible spatial sampling designs (e.g., simple random sampling, cluster sampling).
This chapter provides a brief introduction to basic sampling designs such as simple random sampling, stratified random sampling, systematic sampling, cluster sampling.
The spatial variation of SOC in the accessible area was mostly described by the sampling cluster (71.5%) and the landscape unit (46.3%).
Table 1 Research Design Summary Method Sample Sampling Observations Instrument Analysis Large-N survey current Polish migrants in the UK Cluster random sampling: cluster sampling of polling stations in the UK during Polish presidential elections; simple random sampling to select respondents at the stations.
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Survey procedures within SAS adjusted for multi-stage sampling, clustering, and weighting for selection probabilities.
In two-stage cluster sampling, a simple random sample of clusters is selected and then a simple random sample is selected from the units in each sampled cluster.
All samples cluster in the zone of fluvial and storm/tsunamis episodes.
Figure 11 Sample cluster average and detected arrivals from eight sensors of SR1.
Sixteen cancer samples clustered together, while five cancer samples formed a separate cluster within the normal sample cluster.
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