Search results for "Sampling error"
showing 2 items of 12 documents
Customer satisfaction within a large scale retail trading group: research design and control
2010
Even in contexts where Customer Management techniques are not very advanced, the need for relations with customers is as strong as to suggest expensive ad hoc researches able to simultaneously measure the satisfaction levels, to detect the eventual inadequacy of selling actions, to investigate the relations of customers with competitors. This is why the Grande Migliore Group in Palermo commissioned a research from the University of Palermo. The research was made in year 2008 at 10 Grande Migliore shops in Palermo and in other Western Sicily towns. The multipurpose nature of the research and the features of the customers population suggested the adoption of an ad hoc research design, the fea…
Strategies for identifying dysplasia in Barrett's oesophagus
2012
Abstract Early neoplastic changes in Barrett's oesophagus are often only recognizable visually as discrete mucosal irregularities. With timely diagnosis, the prognosis is excellent, in contrast to advanced tumours in Barrett's oesophagus. The international specialist societies therefore recommend regular endoscopic surveillance for patients who have been diagnosed with Barrett's oesophagus. Following the 1993 Seattle Protocol, the various guidelines consistently require four-quadrant biopsy sampling every 1–2 cm over the entire Barrett's segment and additional biopsies from visually suspicious-appearing areas. This approach is time-consuming and costly, and inevitably involves sampling erro…