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Factor Structure of the WISC-R
Multivariate Behavioral Research, 1989A simultaneous maximum likelihood confirmatory factor analysis was performed on the 12 subtests the WISC-R in the 11 age groups of normative sample. Several models were fit to the data and compared, including: a single-factor model; orthogonal and oblique two-factor models, comprised of the Virbal and Performance subtests, respectively; and orthogonal ...
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R Factors in X-ray fiber diffraction. II. Largest likely R factors
Acta Crystallographica Section A Foundations of Crystallography, 1989The largest likely R factor (that for a structure uncorrelated with the correct structure) is smaller for an X-ray fiber diffraction analysis than for a traditional single-crystal analysis. For example, the largest likely R factor for tobacco mosaic virus determined by fiber diffraction at 3 A resolution is 0.31, compared to 0.59 for a single-crystal ...
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Cancer and the unavoidable R factor
Science, 2017Cancer Etiology Most textbooks attribute cancer-causing mutations to two major sources: inherited and environmental factors. A recent study highlighted the prominent role in cancer of replicative (R) mutations that arise from a third source: unavoidable errors associated with DNA replication. Tomasetti et al.
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Decision Making in Oncology: A Review of Patient Decision Aids to Support Patient Participation
Ca-A Cancer Journal for Clinicians, 2008Dawn Stacey, Carol L Bennett
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