Amounts, proportions, and pseudo-components scales for representing the data in a mixtures design

You can choose one of three scales to represent the data: amounts, proportions, or pseudo-components. With certain combinations of the mixture total and lower bound constraints, the scales are equivalent, as shown in the following table:
Total Mixture Lower bounds Equivalent scales

equal to 1

0

amounts

proportions

pseudo-components

equal to 1

greater than 0

amounts

proportions

not equal to 1

0

proportions

pseudo-components

not equal to 1

greater than 0

none

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