Business Functions Library for Excel

      1. Getting Started
      2. Using The Help File
      3. Top Dozen Functions
      4. Golden Rules
      5. Excel 2007
      1. Go To
      2. Function Selector
      3. CalculateFull
      4. Calculate WorkSheet
      5. Trace Facility
      6. Quick Paste Example
      7. Tutorials
      8. Function Finder
      9. Examples
      10. Help
      11. Excel"s Function Wizard
      12. Access Internet
      13. Usage of Functions (Audit)
      14. Uninstall
      1. Time Periods
      2. Inclusive and Exclusive Dates
      3. Using Daycount
      4. Examples of DayCount
      5. Annual Date Sequences
      6. ProjMode and Inclusive Dates
      7. Date Rolling Convention
      1. Rate Projections Functions Walkthrough
      2. Accruals and Cash
      3. Repeating Formulae
      4. Range Names and References
      5. Optional Parameters
      6. Using PmtsPerYear
      7. Modelling Seasonality
      8. Calculating Interest
      9. Using Business Functions in VBA (Visual Basic for Applications)
      10. Array Functions
      11. Volatility
      12. Annual Equivalent Rates
      13. Array Function
      14. Auto Multi Functions
      15. Variable Plurality
      16. GoalSeek
      1. Introduction To the Worked Examples
      2. Daycount
      3. General Projections
      4. Business Plans
      5. Cashbasis And Periods
      6. Using Timebases
      7. Using Dates
      1. How To Generate a time scale for a structured financing
      2. How To Project Rents off a Rental Forecast
      3. How To Run a model on different time bases
      4. How To Isolate The Cause of a Errors in Cells using Trace
      1. Introduction to the Utilities
      2. Audit
      3. Synchronized Range Insert/Delete
      4. Database Edit
      5. Insert Macro Button
      6. Link Analyser
      7. Range Describer
      8. PrintScript (beta)
      9. Create Local Range Name
      1. Number Formats
      2. Apply BF"s Color Palette
      3. Bullets
      4. Color Cells
      5. Conditional Formats
      1. Validation DropDowms
      2. Validation Standards
      1. Select Excel Function
      2. Array Function Tools
      3. Sort Sheets
      4. Range Value
      5. Named Range Manager
      6. Enforce WorkBook Settings
      7. Monte-Carlo
      8. TimeChart
      1. The ".ini" file
      1. Forum
      2. Online Help
      3. Templates
      1. Conversion of Input Strings to Values
      2. List of Holidays
      3. Acknowledgements and Trademarks
      4. Published Editions Changes in Behaviour
      5. Range Handling And Constraints
      6. Dates in Excel and Business Functions
      7. Old Composite DayCount Format
      8. DayCount in Excels"s Functions
      1. NPV of Annual To Periodic CashFlows - CorrectionM
      2. Interest - Simple, Annual, Continous and Discount Factors
      1. New Functions
      2. Obsolete Functions
      3. Discontinued Functions
      4. Deprecated Functions
    Volatility
    Why some functions in Excel and BF re-calculate with more frequency than others
    Volatile functions always recalculate when the worksheet is calculated, even if their inputs have not changed.

    Excel has some volatile functions:
    • CELL
    • INDIRECT
    • INFO
    • NOW
    • OFFSET
    • RAND
    • RANDBETWEEN
    • RTD

    The reason functions are specified as volatile is because Excel has no means of knowing when to recalculate them because they are in some sense outside of the normal dependency chain. INDIRECT for example, as its name implies, only has an indirect link with its source date - the rangename. Random number functions don"t depend on anything, so the only safe thing to do is to generate a new random number every time the spreadsheet is recalculated.

    BF"s volatile functions are:
    The reason for the first two being volatile is that a reference may change without the target cell of the function actually having changed. The remainder of these functions need to volatile because a random number is involved, either simply returning a random number or using that number to go and sample a statistical distribution.

Business Functions phone: +44 (0)20 8144 9374 (London UK)
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