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Relative value units (RVUs) are comprised of three main components: the work RVU, which reflects the physician's effort and time spent on patient care; the practice expense RVU, which accounts for the overhead costs associated with running a practice, including equipment and staff; and the malpractice RVU, which considers the liability costs related to providing medical services. Together, these components help determine the overall value of medical services and facilitate reimbursement rates from insurance providers.
Relative value is a dimensionless quantity, and so it shouldn't matter what units you want to use, as long as you are consistent.
The relative density of a substance is the ratio of its density to the density of some standard substance. The standard substance for solids and liquids is water. Thus for solids or liquids: Relative density = denisty of substance (kg/m3) / density of water (kg/m3) Relative density therefore has no units, it is a number, and indicates only how many times more dense the substance is than water. The relative density of water is 1 or 1000 kg/m3.
Look at how it is done, then decide for yourself whether you consider this similar or not. Vectors are added by components - add the x-components and the y-components separately. The addition of the individual components is exactly the addition of real numbers (assuming the usual vectors used in physics - but more complicated types of "vectors" are also used in math). On the other hand, the magnitude of the sum of two vectors is usually less than the sum of the magnitudes of the vectors - unless they happen to point in exactly the same direction. For example, a vector 4 units in length plus a vector 3 units in length, at right angles, result in a vector 5 units of length, as is easy to deduce from Pythagoras's Law. However, once again, the components are added just like real numbers.
Among the factors to be considered are the potential need for additional work units as well as the number of additional employees likely to be needed in both existing work units and new work units.