Random Sampling. Simple Random samplingStratified random samplingQuota samplingArea samplingSystematic samplingCluster sampling30 clusters each of 7 individuals. Validity and sample Size. . . . . Sample. Target Population. External Population. . Validity. Sources of Distortion. Target Populat
Journal of Tropical Pediatrics, Oxford University Press.
Target Population Subjects in catchment area
Identification Subjects referred
Contact Participation Follow-up
Final Study Sample
Factors to consider are: