Structured Spreadsheet Modelling and Implementation: A Methodology for Creating Effective Spreadsheets by Paul Mireault

Author:Paul Mireault [Mireault, Paul]
Language: eng
Format: azw3
Publisher: SSMI International
Published: 2017-03-20T04:00:00+00:00

Figure 7‑2 Inventory Model, Three Months

This is the same problem you saw when you introduced the repeating sub-model: this structure does not scale well. A 12-month, 24-month or 60-month model would become impractically large and unwieldy. You would like to be able to identify a group of repeating variables and formulas with the same suffix, so that you can build a repeating group (as you did earlier in Chapter 5). However, the formula that calculates the end-of-month inventory uses variables with two different suffixes.

The key to simplifying the model is to create a new calculated variable for each time instance, which acts as an intermediary between one period and the next. Consider the model presented in Figure 7‑3.

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