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The GL equations are written in a symmetric form by means of continuous link variables.
The required NC data are obtained by equating the elements in the ability function matrix with the corresponding elements in the probe location matrix in order to solve the CMM link variables.
We adopted two link variables in our model.
DAGs link variables with directional arrows to identify those that may bias results.
In case of the DN model, we can use link variables as intermediate products for both divisions.
This is possible because in QLMs the link variables U i j and U i j † are no longer complex numbers, but non-commuting operators.
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We used "average revenue per inpatient per day" as a link variable from Division 2 to Division 1.
The existence of a link variable is one of the key differences between the DN model and the BB model.
We used the number of beds in emergency units as an output and used total number of medical beds as the link variable.
The link variable is an intermediate product that acts simultaneously as an output for Division 1 and an input to Division 2. Using an intermediate product, we can evaluate multiple production steps among divisions in one DMU.
We set the "number of beds" as a link variable from Division 1 to Division 2. We assumed that Division 1 is in charge of the funding and maintenance of medical beds.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com