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Using both factor analytical and chemical mass balance methods in the same analysis may partially compensate for weaknesses in each method.
This analysis was the first, to our knowledge, to compare epidemiologic results incorporating both factor analytical and chemical mass balance source impacts as exposure terms.
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Findings also highlight the need to consider both factor analytical results and component-specific results when interpreting findings.
Other investigators have employed factor analytical and other source apportionment methodologies to try to identify the sources of PM influencing toxicological outcomes (e.g., Chen et al. 2010); however, to date, these methods have been more widely employed in epidemiological studies (e.g., Sarnat et al. 2008).
Tests of cross-country equivalence were performed using a factor analytical framework and through tests of (1) the full MI of the scales and (2) the MI with alignment.
Because factor models with categorical observed variables are based on conditional probabilities, intercept parameters are fixed to zero and residual variances are fixed to 1 using a factor analytical approach (Millsap and Yun-Tein 2004).
To assess the MI, we used a multi-group factor analytical framework with and without alignment.
Researchers have advanced construct measurement of PSC through the use of relational approaches that focus on convergent and discriminant validity 22 and through the use of exploratory and confirmatory factor analytical approaches designed to identify unique PSC dimensions.
Exploratory and confirmatory factor analytical studies identified three underlying factors in the negative symptoms construct including 1) affective flattening 2) avolition/apathy and anhedonia/asociality and 3) inattention/alogia [ 13- 15].
The findings of this study and similar factor analytical studies can lend empirical support for changes to classification systems such as the Diagnostic and Statistical Manual-IV (DSM-IV) that are being undertaken currently.
The "sorts" are then analysed with a factor analytical procedure, in which items are viewed as cases and participants as variables.
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