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Chapter 9 Paired Data Paired data
Chapter 9 Paired Data Paired data

DevStat8e_15_03
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... A.13 once the desired level of significance  is specified. For fixed x1,    , xn, the 100(1 – )% signed-rank interval will consist of all 0 for which H0:  = 0 is not rejected at level . To identify this interval, it is convenient to express the test statistic S+ in another form. ...
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... Before we proceed, a few words about notation. The subscript “i” (in Xi) in the above formula represents the fact that there will be a number of values of the variable X, one for each observation: X1 is the value of X for observation one (the first subject or respondent), X2 is the value of X for th ...
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... Planned or Posthoc Pairwise Comparisons • If significant main (and possibly simple) effects are found, it is common to follow up with one or more pairwise tests. • It is most common to test differences between marginal means within a factor (i.e., pooling over the other factor). • In this example, ...
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... applied in a similar fashion as in the Goodness-of-fit test. You may also use the Haber correction (Zar 4th edition pages 494-495; example 23.3). In Zar 5th edition, it is called the Cochran-Haber correction (pages 501-502, example 23.4). The Haber (Cochran-Haber) correction is actually simple, alth ...
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... been suggested (e.g. Broune. 1962) that large sample sizes may be needed when fourthorder moments (i.e.. kurtosis) are estimated. Unfortunately. there is no rule of thUmb to choose the appropriate sample size in this situation. As a rough estimate. at least. four or five hundred observations might b ...
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Psychometrics

Psychometrics is a field of study concerned with the theory and technique of psychological measurement. One part of the field is concerned with the objective measurement of skills and knowledge, abilities, attitudes, personality traits, and educational achievement. For example, some psychometric researchers have, thus far, concerned themselves with the construction and validation of assessment instruments such as questionnaires, tests, raters' judgments, and personality tests. Another part of the field is concerned with statistical research bearing on measurement theory (e.g., item response theory; intraclass correlation).As a result of these focuses, psychometric research involves two major tasks: (i) the construction of instruments; and (ii) the development of procedures for measurement. Practitioners are described as psychometricians. All psychometricians usually possess a specific qualification, and while most are psychologists with advanced graduate training, many work for the government or in human resources departments. Others specialize as learning and development professionals.
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