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Modelling and Decisions in Excel

The difference between a spreadsheet and a model: assumptions you can change in one place, arithmetic that shows its reasoning, and a number at the end that supports a decision rather than just existing.

Pathaxis · Original content

Written in house, from the work rather than from a syllabus. Every example is one we would use ourselves, and every exercise is checked against the same engine that grades your answer.

86 min 6 lessons 16 quiz questions 7 exercisesStart course

What you’ll learn

  • Separate assumptions from calculations so a model can be questioned
  • Project a value forward by compounding, and work a growth rate back out
  • Work out a repayment, a rate or a term with PMT, RATE and NPER
  • Decide whether a project is worth doing with NPV and IRR, and say what each assumes
  • Build a sensitivity table showing how the answer moves when an assumption does
  • Audit a workbook you did not write, and find what it is hiding

Before you start

  • · Excel Foundations, in particular absolute and mixed references
  • · Summarising and Reporting in Excel, or comfort building a grid from one formula

Syllabus

01

Building something that can be questioned

Assumptions in one place, and arithmetic that refers to them.

03

Testing and checking

Scenarios, sensitivity, and auditing a sheet you inherited.