Excerpt - page 25: "... is a mathematical necessity that if there is only one factor that is common to all of the variables and no two (or more) variables have any other factor(s) in common, then any two columns of correlations will have a constant proportionality. ..."
Excerpt - page 26: "... since it can be dilated (or compressed) by a constant factor of proportionality. A common example is converting meters into yards or yards ..."
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Excerpt - page 40: "... weighted by more or less homogeneous positive quantities will approach proportionality with unweighted sums. First centroid factor loadings will therefore be in reasonably good approximation to first ..."
