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Private Function CalcSchedPrinc（period As Integer） As Double#计算应付本金
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Private Function CalcNewDefault（period As Integer） As Double#计算新违约额
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Private Function CalcPrepay（period As Integer） As Double#计算提前偿付额
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Private Function CalcAmortFactor（period As Integer） As Double#计算分期偿还因子
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Private Function CalcIntRate（period As Integer） As Double#计算利率
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Private Function CalcPrepayPenalty（period As Integer） As Double#计算预缴罚款
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（二）负债方模块
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1.债券结构师模块
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该模块对交易中的证券进行分析运算计算并按照交易条款和结构来分配资产池模块计算所得的现金流、维护各种信贷增强机制、计算衍生工具现金流、计算债券现金分配等。
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Public Sub waterfall（）＃计算债券方的所有现金流
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Public Sub PrintDeal（）＃在Excel上列出交易的现金流
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Public Sub PrintBond（）＃在Excel上列出债券的现金流
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Private Function CalcMoreSeniorBal（period As Integer，Seniority As Integer）As Double
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#计算比目标等级债券高级的债券的剩余面额
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Private Function WTF_SeniorPrincipal（period As Integer，availFund As Double） As Double#用剩余现金流偿付高级债券本金
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Private Function SetExcessSpread（period As Integer，ex As Double） As Double#计算剩余利差额
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Private Function CalcSeniorDist（period As Integer，groupNum As Integer） As Double#计算群组的高级债券应还本金额
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Private Function CalcGroupPercent（period As Integer，groupNum As Integer） As Double#按不同指定规则（房利美或房地美方法）计算目标群组本金百分比
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Private Function CalcPDA（period As Integer） As Double#计算总债券应还本金额
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Private Function CalcSeniorPDA（period As Integer） As Double#计算高级债券应还本金额
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Public Function CalcSubPDA（period As Integer，Seniority As Integer） As Double#计算次级债券应还本金额
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Private Function CalcAcceleration（period As Integer） As Double#计算超额抵押目标现金流
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Private Function CalcOCBalance（period As Integer） As Double#计算超额抵押额
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Private Function CalcOCTarget（period As Integer） As Double#计算超额抵押目标
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Private Function CalcStepdown（period As Integer） As Boolean#计算目标月份是否进入超额抵押递减期
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