Scaling is the branch of measurement that involves the construction of an instrument that associates qualitative constructs with quantitative metric units scaling evolved out of efforts in psychology and education to measure unmeasurable constructs like authoritarianism and self esteem. This method of scaling is used in the scale command the ctrl command the ordinary ras routine and the gross value ras routine right direction scaling right direction scaling is a second method of scaling that preserves the relative ordering of the elements and scales them all in the same direction. Certain methods of scaling permit estimation of magnitudes on a continuum while other methods provide only for relative ordering of the entities the level of measurement is the type of data that is measured. Scaling methods is written for professionals in the behavioral sciences who analyze data that results from subjective responses other books on scaling attitudes or measuring perceptions focus on the psychometricians view of measurement. Scaling methods detailed explanation of the mean and quantile quantile scaling methods used mean scaling the essentials of the approach used for mean scaling are illustrated in figure 1 below for details of which variables have been scaled in this way see the table of variables on the application ready data page
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