Business Functions Library for Excel

Business Functions Library for Excel

Function Reference Home Date and Time Calculations Introduction Date Information Introduction DYear DMonth DateYMD DateSeqNum IsSeqDate DayName MonthName IsLeap DaysInMonth IsAnniversary WeekNumber WeekNumberToDate MonthStart MonthEnd NumPers MostRecent MostImminent TimeBaseLengths AnnSeq CreateTimeBase Date Difference Introduction DiffY DiffM DiffD DiffP Date Increment Introduction DpY DpM DpD DpP PrevDateSeq NextDateSeq PrevDateList NextDateList NextDateCombine DatePer EDateBF DateSeq DateSeqCombine Time Period Introduction TpY TpM TpD Occurs Special Dates Introduction Business Days Introduction DpYBD DpMBD DpDBD NextBD PrevBD NextDateSeqBD PrevDateSeqBD IsBD NetWorkDaysBF NextDateListBD PrevDateListBD Holidays Introduction Holiday DescribeHol WhatHol IsHol IsWE WesternEaster CreateDate Discrete Amount Projections Introduction Payments Introduction MkPmtsSeq MkPmts MkPmtsGrow MkPmtsFcst MkPmtsSF MkPmtsLim MkPmtsLag MkPmtsLagProf RePhasePmts TotPmts TotPmtsSF SumBetween DoBetween MatchPmts CarryNeg CarryPos MkPmtsX MkPmtsLagX MkPmtsIdx MkPmtsCats MkPmtsGroup Payments Periodic Introduction MkPmtsPer MkPmtsPerGrow MkPmtsPerFcst MkPmtsIdxPer Payments Market Introduction MkPmtsGrowMkt MkPmtsFcstMkt MkPmtsPerGrowMkt MkPmtsPerFcstMkt Distributed Amount Projections Introduction Time Spread Introduction GSpread UniSpread UniSpreadGrow SCurve SCurveGrow DistSpread FStepSpread TStepSpread MkPmtsWeighted SCumCurve Time Spread Periodic Introduction UniSpreadPer SCurvePer SCurveGrowPer UniSpreadGrowPer Time Spread Weighted Introduction WeightSpread FWeightSpread TWeightSpread Time Spread History Introduction UniSpreadH SCurveH WeightSpreadH FWeightSpreadH TWeightSpreadH DistSpreadH GSpreadH UniSpreadAdj SCurveAdj WeightSpreadAdj FWeightSpreadAdj TWeightSpreadAdj DistSpreadAdj GSpreadAdj Constant Rate Projections Introduction Constant Rate Introduction Con ConGrow AnnGrow RePhaseCon AnnRate ConSF ConIdx ConEvent Constant Rate Periodic Introduction ConPer AnnGrowPer ConGrowPer Constant Rate Market Introduction ConGrowMkt ConFcstMkt ConFcstGrowMkt Constant Rate Revenue Introduction ConRevGrow2 ConRev ConRevGrow ConRevFcst Stepped Rate Projections Introduction Stepped Rate From Introduction FStep FStepGrow FStepGrowX FStepThenGrow FStepFcst FStepGrown FStepSF FStepCombine MultiFStep Stepped Rate To Introduction TStep TStepGrow TStepGrowX TStepThenGrow TStepFcst TStepGrown TStepSF TStepCombine MultiTStep Stepped Rate Market Introduction FStepGrowMkt FStepFcstMkt TStepGrowMkt TStepFcstMkt Stepped Rate Revenue Introduction FStepRev TStepRev FStepRevGrow FStepRevFcst TStepRevGrow TStepRevFcst FStepThenGrowRev TStepThenGrowRev Interpolated and Curve-Fitted Projections Introduction Interpolated and Curve-Fitted Rates Introduction FittedRate Ramp Interpolated and Curve-Fitted Levels Introduction InterpedLevel FittedLevel Instantaneous Level Projections Introduction Levels Introduction Bal Level FLevels TLevels FLevelsGrow TLevelsGrow FLevelsFcst TLevelsFcst FLevelsCombine FLevelsThenGrow TLevelsThenGrow Levels Market Introduction FLevelsGrowMkt TLevelsGrowMkt FLevelsFcstMkt TLevelsFcstMkt Growth Introduction Grow GrowFromTo FGrowStep TGrowStep FGrowStepMkt TGrowStepMkt GrowMkt GrowLin Forecast Introduction Fcst FcstGrow FcstCollar SumFcst FFcstStep TFcstStep IdxFromTo Forecast Specific Times Introduction FcstT TFcstT Levels Over Time Projections Introduction Levels Average Introduction ALevel FALevels TALevels FALevelsGrow TALevelsGrow FALevelsFcst TALevelsFcst FALevelsThenGrow TALevelsThenGrow ALevelGrow Levels Average Market Introduction FALevelsGrowMkt TALevelsGrowMkt FALevelsFcstMkt TALevelsFcstMkt Growth Average Introduction AGrow Projections NPV Introduction NPV Constant Rate Introduction PVCon PVAnnGrow PVConGrow PVConQ NPV Stepped Rate Introduction PVTStep PVTStepQ PVTStepIC PVTStepICQ PVFStep PVFStepIC PVFStepQ PVFStepICQ NPV Payments Introduction PVMkPmtsSF PVMkPmts NPV Time Spread Introduction PVGSpread PVUniSpread PVSCurve PVSCurveGrow PVDistSpread PVFStepSpread PVTStepSpread PVMkPmtsWeighted PVSCumCurve Time Value Of Money Analysis Introduction Basic Interest Rate Conversions Introduction SimpleToSimple SimpleToAER SimpleToCont SimpleToDF AERToSimple AERToCont AERToDF ContToSimple ContToAER ContToDF DFToSimple DFToAER DFToCont Advanced Interest Rate Conversions Introduction SimpleToSimpleX SimpleToAERX SimpleToContX SimpleToDFX AERToSimpleX ContToSimpleX DFToSimpleX RateConvert Annuity Introduction FVM PVM PmtM TermM IntRateM PVEGAnn PVEGAnnM PVEGPerAnn PVEGPerp PVEGPerpM PVEGPerPerp SumEGAnn SumEGAnnM SumEGAnnCont SumLGAnn SumLGAnnM SumLGAnnCont Annuity Extended Introduction PVBF PMTBF RateBF US APR Introduction APRToQuoted QuotedToAPR Discounted Cash Flow Introduction DCF One-Off Introduction PVOne FPVOne TPVOne PVOneQ DCF Annual Introduction PVA IRRA PayBackA PayBackDiscA DurationA AvLifeA DCF Even Intervals Introduction PVE IRRE PaybackE PayBackDiscE DurationE AvLifeE DCF Specific Times Introduction PVT IRRT PayBackT PayBackDiscT DurationT AvLifeT PVTIC IRRTIC PVTX IRRTX PVTCX IRRTCX PVTR IRRTR DCF Dispersed Annual Introduction NPVM IRRM CorrectionM CorrectionCont CorrectionDC DurationM AvLifeM EffTimeM Accounting And Tax Introduction Accounting Introduction Depreciate DepreciatedValue DepPoolWIP DepPoolRatio DepPool DepreciatePer DepreciateGrowPer DepreciateFcstPer DepreciateIdxPer LIFOPrice LIFOCalc Tax Introduction FAvRate TAvRate FAvRateTD TAvRateTD Mathematical Calculations Introduction Statistics Introduction LinReg BestPoly SignChanges RSqrdPoly PolyEqn CalcPoly PolyReg Range Operations Introduction Range Lookup Introduction LookupNum LookupN SeekNum PickNum SortPick LookUpNum2D PickMatrix LookupNIndex Seek SeekList SortNum FindIf Range Sum Introduction DoBetweenX SumCat SumCats SumPos SumNeg SumDiv SumBounds SumSubRange SumCombine SelCats Range Reference Introduction Coordinates WorkSheetName RefPlus GetRef Range Calcs Introduction MinBetween MaxBetween MeanNZ WeightAv Range Information Introduction RangeDir Range Manipulation Introduction SortText ApplyToList CombineLists TransposeNum Unique Interpolation Introduction Interp Interpolate InterpDate InterpolateDate Intersection Simulation Modelling Introduction Monte Carlo Introduction Distribution PartialDependency DistCumulative DistUniform DistTriangular DistDoubleTri DistNormal DistLogNormal RandNum NRandom PickRandom DescribeDistType CumProb Real Estate Introduction Rent Introduction RentGrow RentFcst Rent From Introduction FStepRent FStepRentGrow FStepRentFcst FStepRentFcstCollar Rent To Introduction TStepRent TStepRentGrow TStepRentFcst TStepRentGrowCollar TStepRentFcstCollar Rent Reletting Introduction RentFcstR RentGrowR FStepRentGrowR FStepRentFcstR TStepRentGrowR TStepRentFcstR TStepRentGrowSFR FStepRentGrowSFR TStepRentFcstSFR FStepRentFcstSFR UK Valuation Introduction CapValue EqYield CapValueG EqYieldG CapValueGD EqYieldGD NomToTrue TrueToNom YPP YPPDef YPA YPADef CapValueGrowGD CapValueFcstGD EqYieldGrowGD EqYieldFcstGD UK Valuation DCF Introduction CapValueDCF EqYieldDCF CapValueDCFG EqYieldDCFG CapValueDCFGD EqYieldDCFGD NomToTrueDCF TrueToNomDCF YPADefDCF YPPDefDCF TheorYield ImpGrowth ImpDiscRate PVRent TWRR NPV Rent Projections Introduction PVRentGrow PVRentFcst PVTStepRent PVTStepRentGrow PVTStepRentFcst PVTStepRentGrowR PVTStepRentFcstR PVTStepRentGrowIC PVTStepRentGrowRIC PVTStepIdxRentGrowR PVTStepIdxRentFcstR Retail Rent Introduction TStepGTurnRentGrow TStepGTurnRentGrowR Index Rent Introduction IdxRentGrowR IdxRentFcstR IdxRentGrowMktR IdxRentFcstMktR TStepIdxRentGrowR TStepIdxRentFcstR Real Estate Costs Introduction LetCostR LetCostRQ LeasingFeeGrowR FServChargeR ServChargeGrowR ServChargeFcstR FServChargeGrowR FVacServChargeR VacServChargeGrowR VacServChargeFcstR LeasingFeeFcstR Real Estate Costs UK Introduction UKRatesGrow UKRatesFcst UKRatesGrowR UKRatesFcstR UKEmptyRatesFcstR UKEmptyRatesGrowR Lease Information Introduction LeaseEnd ReletOccurs RentDateInfo RentEventOccurs RentEvent LastReview NextReview LastReviewR NextReviewR LeaseInfo Occupancy LeaseDates Banking Introduction Interest Introduction Interest FInterest TInterest TotInterestSF InterestX PVFInterest PVInterestX PVInterest Yield Curve Introduction ZeroCoupon FutureToSpot SpotToSpot Loan Introduction Loan LoanX LoanLin LoanLinX Mortgage MortgageQ LoanPool MortgagePool IdxBondGrow IdxBondFcst Residual Cash Introduction Overdraft CashAcct FlexAcct CurrentAcct STDAcct LoanAcct LoanAcctEM Equity Trading Introduction BetaIndex BetaReturns DescribeReturn TotalReturn Options Introduction OptionBS OptionBinom OptionMonte Petroleum Economics Introduction Petroleum Engineering Introduction STOIIP Decline Curve Introduction Decline DeclineRate DescribeDecline ProdProf AbandonDate StartDecline Text Introduction Numbers To Text Introduction MoneyText Text String Introduction GetToken GetTokens InString ExInt ExFl Miscellaneous Introduction Special Arithmetic Introduction StdEq DiffGaps AddGaps Rounding Introduction SRound SFloor SCeiling RoundWeekDay RoundMonthDay RoundMD RoundDateSeq DateRound DateFloor DateCeiling Disperse RoundList Library Information Introduction BFVer DescribeLoanAcctOutput DescribeCombineSwitch DescribePmtsPerYear DescribeLevelSwitch DescribeBD DescribeDayCount DescribePeriods DescribeLookup DescribeRounding DescribeLoanOutput DescribeShape ArgValues Flow Of Control Introduction Switch SwitchR SwitchT SwitchRT IfElse IfElseR IfElseT IfElseRT Comparisons Introduction CollarDate InBetween Collar Excel Information Introduction Ev	Note: In order to use the spreadsheet examples, you need to download Business Functions
	DepPoolWIP (Time, Base, FromDatesInt, IntSimple, AdditionDates, Additions, ISDates, LifeOrDecRate, DepType, [FinalValue], [DepSwitch], [DayCount], [Periods], [DayCountDisc], [PrdsDisc])
	Operate a Depreciation Pool using the WIP method
	Calculates the ongoing depreciation, written down and WIP value for a depreciation stream using the WIP Method
	Auto Array Function
	Methodology
	There are three functions in this family that operate a depreciation pool: DepPool, DepPoolRatio and DepPoolWIP. A depreciation pool is where a series of costs for an asset are progressively accumulated in WIP (work in progress), and then subsequently depreciated on the date(s) when an asset goes into service. The asset cost, which is accumulating in WIP, can accrue interest, and there can be several dates at which a portion of the asset goes into service, each portion having its own depreciation stream. The reason for having several dates when a portion of the asset goes into service is simply to reflect reality, when a producing asset doesn"t go into use on one date, but rather over a period of time as it is fully commissioned. The 3 functions relate to the 2 methods of operating a depreciation pool in common use. DepPoolWIP uses the relatively simple WIP method, DepPoolRatio uses the more complex but widely used Ratio accounting method; and DepPool uses either method depending on whether you specify any ISPortions or not. For Both Methods: The costs, or Additions as they are called, are added to the WIP on the AdditionDates. They optionally accrue interest at IntSimple using a daycount of DayCountDisc and a compounding frequency given by PrdsDisc. For the WIP Method: On each of the in-service dates, or ISDates, whatever is in WIP is crystallised, capitalised and commences its own depreciation stream. The WIP then accumulates, starting at zero, any new Additions, again compounding the interest. At the next ISDate, the WIP is cleared again and depreciated, and so on until the last of the ISDates. For the Ratio Method: The deficiency with the WIP method is that the amount going into service on each in-service date is a bit arbitrary - it"s whatever is in WIP at the time, rather than relating in some way to the portion of the asset that has really gone into service. The Ratio method defines a set of proportions, or ISPortions, of the ultimate value of the asset, that go into service on each of the ISDates. On each in-service date the relevant portion of the total (ie future, or final value) is withdrawn from WIP and depreciated. Whatever is left in WIP accrues interest, alongside any new Additions. Computationally this method is much harder to do on a spreadsheet since, depending how you do it, it probably creates a degree of circularity - you don"t know how much to depreciate on the first in-service date until of you"ve calculated the total amount to be depreciated, which depended on that first amount that was taken out of WIP and depreciated. Note: DepPool, the main function, simply calls DepPoolRatio or DepPoolWIP, depending on the existence of ISPortions. DepPool doesn"t do any calculation itself, it just calls one of the two calculation functions.
	Tip
	DepPool, DepPoolWIP and DepPoolRatio do a lot of internal calculation, and have been greatly optimised for use as Array Functions, which greatly reduces the amount of unnecessary recomputation. We strongly recommend using these three functions as array functions - they are possibly 3 times faster used this way.
	Tip
	When it comes to computation, this function needs to traverse internally each date in implied by PrdsDisc, for every appropriate year. This is so that any compounding is done accurately with respect to the slight irregularity in time length that occurs from period to period. You can, in many circumstances, make the function go faster, at the cost of a very slight degree of accuracy, by converting the interest rates to annual equivalent rates (AER"s) using SimpleToAER and then using a PrdsDisc of -1.
	Example DepPoolWIP.xls

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