| The Inventory
add-in provides three kinds of functions: deterministic, stochastic
and work in progress. All have the prefix "INV_" and
appear on the user defined function list. The functions
are used in the data forms constructed by the add-in to compute
results concerning inventory systems. They may also be used
outside the constructs of the add-in on worksheets entirely
constructed by the user.
Although some of the results associated with inventories can
be calculated with simple Excel formulas, we provide functions
that are very general. For example, the same function computes
the average inventory level for all kinds of inventories ranging
from the simplest deterministic inventory with no shortages
to stochastic inventories with lost sales. The function knows
which result to compute by the data presented to it.
Most of the functions are stand-alone in the sense that most
do not require as inputs the results of any other function.
As long as the user provides data in the correct order, the
function can be used directly on any Excel workbook.
It is possible to extract the add-ins into a different workbook,
but it is made somewhat difficult because the functions in their
internal coding use the results of other functions and subroutines
in the Inventory add-in. All the functions related
to deterministic and stochastic inventories are located on a
single VBA module called function_mod. If this entire
module is copied to the VBA code of another workbook, the functions
become available to that workbook. Similarly, the functions
related to work in progress are on the module function_other_mod.
The easiest way to use the functions is to have the Inventory
add-in installed. The functions are then all available to all
open workbooks.
The three kinds of functions are described on separate pages.
To reach these pages click the links at the left or below.
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