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#### principal component analysis

Principal Component Analysis (PCA) Introduction The process of Principal Component Analysis (PCA) performs dimensionality reduction on a set of data, and especially a scale that is attempting to evaluate a construct. The point of this process is to see if a multi-item scale can be reduced into a simple structure with fewer components (Kline, 1994). For example, […]

#### research subgroup Dx boundary value, and confidence intervals for μ

Research groups and subgroups’ summary data for Dx ranges and CIs for μ; Rationale for boundary value adjustment to Dx = 592.5 As far as possible it is necessary for the principal research subgroups DNI and DI-600 to share the similar Dyslexia Index characteristics in order that the Academic Behavioural Confidence can be compared […]