Scott Menard, in Encyclopedia of Social Measurement, 2005 Panel Attrition and Missing Data Missing data can occur in both cross-sectional and longitudinal research, but longitudinal panel research involves more possible types of missing data and more ways in which to address the problem. In longitudi...
A. Diederich, in International Encyclopedia of the Social & Behavioral Sciences, 2001 1.1 Unknown Sample Distribution: Secretary-type Problems Kahan et al. (1967) investigated decision behavior in a sequential search task where the DM had to find the largest of a set of n = 200 numbers, obser...
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aUse of social networks was prevalent, with owner-managers being particularly adept at using social networks, as also were the business development and marketing employees in the US sample 对社会网络的用途是流行,当所有者经理是特别娴熟在使用社会网络,象也业务发展和营销雇员在美国样品 [translate] ...
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Human errors are the main causes of security vulnerability. Security standards and policies should be followed by all staff members to avoid social engineering penetration attempts. Examples of these standards include not to mention any sensitive information in email or phone communication. Security audit...
Andrew B. Whitford, in Encyclopedia of Social Measurement, 2005 Interpretation of Pearson's r As noted, the correlation coefficient provides information about the direction of the relationship and its strength. The range of possible values for the correlation coefficient provides an ordinal scale of ...
John A.Grummel, inEncyclopedia of Social Measurement, 2005 Sampling Concerns There are a number of problems associated with using samples. Before proceeding with the problems, however, it is important to discuss the idea of random sampling. The objective of random sampling is to select a particula...