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Survey Research Methods and Applications
di Ed. 2011 Pagg. 236
edito da Edizioni Plus - Universita' di Pisa
Survey methodology includes a variety of research themes, both in a theoretical and applied perspective. This book collects some recent contributions from acknowledged survey methodologists and statisticians to the fundamentals of survey data collection and methods, describing how the details of surveys affect the quality of their results. The contributions focus on specific topics such as sampling from elusive populations, small area estimation, data integration and statistical matching, panel data and longitudinal analysis, non-sampling errors. A special attention is dedicated to survey methods in business surveys, in agricultural and forestry and to survey methods for Census data. Dealing with multiple aspects of the design, execution and evaluation of surveys, this book will prove helpful for all survey researchers, students, statisticians and practitioners who are interested in up-to-date collection of survey methods and applications.
" (u! ) of formula (4). The last two columns contain the interpolation results obtained without using the spatial information, i.e., the population mean that excludes the value to be predicted and the corresponding “structural bias”.
Let us consider the case of the fifth location ! = 5, for which the “structural bias” ! (u5 ) is very close to zero so that the population interpolated value predicts the real value well. Figure 2 shows the results of the prediction as the sample dimension n increases (from 2 to 13). The left panel of the figure shows the convergence of the biased predictor (1) to the approximated expectation (3), which therefore suitably captures the prediction of ! (u5 ) . The left panel shows the trend of the predicted value when distances are used, whereas the right one does not use any spatial information and is equivalent to simple random sampling. The variance shown in the right panel is systematically lower than the variance of the left panel, but the unbiased...
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