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I think it means that electronegativity is value that is calculated through a formula based on other values, whereas other values such as IE, electron affinity, and atomic radius are already found and don't require a formula for calculation.
Electronegativity is a value that is calculated from an formula. In the textbook section 2D.1, it mentions that the values were first calculated with an expression that determines the differences in electronegativity between bonds by using dissociation energies of that bond. All of the other periodic trends are actual values that are can be experimentally observed, while electronegativity is a calculated measure of the electron attraction ability.
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