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objective measurements. It has been argued that self-report is a questionable practice when new data collection is possible and when the objective is to identify and de ne a few targeted diseases with high levels of sensitivity and speci city (M. Elias et al., 1990), unless of course, subject risk is unacceptably high in relation to bene ts. Because self-report may be the focus of health-aging research or a necessary evil, it is important to understand its limitations. Costa and McCrae (1985) point out that the employment of self-ratings as proxy measures of objective health status is common and that investigators often justify this approach based on statistically signi cant correlations between physician-rated health and self-ratings, even though those correlations are modest. A series of classic studies has shown that self-report of disease and disease itself are not veridical and can be in uenced by neuroticism and many other social-psychological factors, including disease (e.g., Costa & McCrae, 1985). We can not ignore information that can be gained from archival data, retrospective studies, or large sample mail or phone survey data because objective assessment of disease is not possible. However, the investigator is charged with the responsibility of establishing the validity of the self-report measuring techniques used. Where possible, however, the ascertainment of the reliability of selfreport data via medical case records, follow-up with physicians and other informants, and treatment history is highly desirable.



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[ Using the Toolbox s Rectangular Marquee tool (set to a 0 Feather), draw a selection around the top of the lighthouse.

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FIGURE 14-18





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Note that 8-bit images are different from 24-bit images in that they are created with a reduced file size. These images use a color table (or palette) of 256 RGB values. This means the color table has 256 entries. The pixels are represented by a single byte, which specifies which RGB value to use from the color table. To hide data in 8-bit images, S-Tools modifies the image to use only a 32color palette instead of 256. The 32 colors are duplicated 8 times (32 8 = 256), to fill the color table with duplicate entries. S-Tools can then use the duplicate entries to store the secret message in the three LSB for each RGB entry. Because each color in the modified image can be represented in eight different ways, information can be hidden in any of the redundant representations. This is the method used most often by S-Tools because most images are stored as 8-bit to save space.

FIGURE 6.22 With the Channel Mixer dialog you can mix various amounts of the original color channels together for each output channel.

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This section is devoted to the discussion of linear second-order elliptic problems. We begin by deriving the weak formulation of a model problem in Paragraph 1.2.1. Properties of bilinear forms arising in the weak formulation of linear elliptic problems are discussed in Paragraph 1.2.2. In Paragraph 1.2.3 we introduce the Lax-Milgram lemma, which is the basic tool for proving the existence and uniqueness of solution to linear elliptic problems. The weak formulations and solvability analysis of problems involving various types of boundary conditions are discussed in Paragraphs 1.2.5-1.2.8. Abstract energy of elliptic problems, which plays an important role in their numerical solution (error estimation, automatic adaptivity), is introduced in Paragraph 1.2.9. Finally, Paragraph 1.2.10 presents maximum principles for elliptic problems, which are used to prove their well-posedness.

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